name: CI
concurrency:
  group: ci-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true
on:
  # The merge queue is the pre-merge gate for the protected branches (master,
  # develop): a merge_group run validates the merged result before code lands. For
  # now PRs and merge_group runs build the same narrowed board subset (--level pr);
  # see the setup job. push still runs the full matrix on master/develop (post-merge)
  # as well as on the event/* and feature/* branches, which have no merge queue.
  merge_group:
    types: [checks_requested]
    branches:
      - master
      - develop

  push:
    branches:
      - master
      - develop
      - event/*
      - feature/*
    paths-ignore:
      - "**.md"
      - version.properties

  pull_request:
    branches:
      - master
      - develop
      - event/*
      - feature/*
    paths-ignore:
      - "**.md"
      #- "**.yml"

  schedule:
    # Nightly develop build, published to meshtastic.github.io firmware-nightly/ (no GitHub release).
    # Scheduled runs execute on the default branch (develop). 07:00 UTC avoids the 00:00 tests
    # and 02:00 daily_packaging crons.
    - cron: 0 7 * * * # Nightly develop build/publish (default branch is develop)

  workflow_dispatch:
    inputs:
      # trunk-ignore(checkov/CKV_GHA_7): intentional manual-test switch for the nightly publish path
      nightly:
        description: "Nightly mode: build + publish develop to github.io firmware-nightly/ (skips creating a GitHub release)"
        type: boolean
        default: false

permissions: read-all

jobs:
  setup:
    strategy:
      fail-fast: true
      matrix:
        arch:
          - all
          - check
    runs-on: ubuntu-24.04
    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-python@v6
        with:
          python-version: 3.x
          cache: pip
      - run: pip install -U platformio
      - name: Generate matrix
        id: jsonStep
        run: |
          # PRs and (for now) merge_group builds use the narrowed --level pr board
          # subset. Full-matrix builds run on push / schedule / workflow_dispatch.
          if [[ "$GITHUB_EVENT_NAME" == "pull_request" || "$GITHUB_EVENT_NAME" == "merge_group" ]]; then
            TARGETS=$(./bin/generate_ci_matrix.py ${{matrix.arch}} --level pr)
          else
            TARGETS=$(./bin/generate_ci_matrix.py ${{matrix.arch}})
          fi
          echo "Name: $GITHUB_REF_NAME Base: $GITHUB_BASE_REF Ref: $GITHUB_REF"
          echo "${{matrix.arch}}=$TARGETS" >> $GITHUB_OUTPUT
          echo "$TARGETS" >> $GITHUB_STEP_SUMMARY
    outputs:
      all: ${{ steps.jsonStep.outputs.all }}
      check: ${{ steps.jsonStep.outputs.check }}

  version:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
      - name: Get release version string
        run: |
          echo "long=$(./bin/buildinfo.py long)" >> $GITHUB_OUTPUT
          echo "deb=$(./bin/buildinfo.py deb)" >> $GITHUB_OUTPUT
        id: version
        env:
          BUILD_LOCATION: local
    outputs:
      long: ${{ steps.version.outputs.long }}
      deb: ${{ steps.version.outputs.deb }}

  check:
    needs: setup
    strategy:
      fail-fast: false
      matrix:
        check: ${{ fromJson(needs.setup.outputs.check) }}
    # Runs on GitHub-hosted runners so checks don't compete with builds for the
    # self-hosted 'arctastic' pool (which builds use).
    runs-on: ubuntu-latest
    if: ${{ github.event_name != 'workflow_dispatch' && github.repository == 'meshtastic/firmware' && github.event_name != 'schedule' && github.event.inputs.nightly != 'true' }}
    steps:
      - uses: actions/checkout@v7
        with:
          submodules: recursive
      - name: Check ${{ matrix.check.board }}
        uses: meshtastic/gh-action-firmware@main
        with:
          pio_platform: ${{ matrix.check.platform }}
          pio_env: ${{ matrix.check.board }}
          pio_target: check

  build:
    needs: [setup, version]
    strategy:
      fail-fast: false
      matrix:
        build: ${{ fromJson(needs.setup.outputs.all) }}
    uses: ./.github/workflows/build_firmware.yml
    with:
      version: ${{ needs.version.outputs.long }}
      pio_env: ${{ matrix.build.board }}
      platform: ${{ matrix.build.platform }}

  build-debian-src:
    if: ${{ github.repository == 'meshtastic/firmware' && github.event_name != 'schedule' && github.event.inputs.nightly != 'true' }}
    uses: ./.github/workflows/build_debian_src.yml
    with:
      series: UNRELEASED
      build_location: local
    secrets: inherit

  MacOS:
    if: ${{ !contains(github.ref_name, 'event/') && github.event_name != 'schedule' && github.event.inputs.nightly != 'true' }}
    strategy:
      fail-fast: false
      matrix:
        macos_ver:
          - "26" # ARM64
          # - '26-intel' # x86_64
          - "15" # ARM64
          # - '15-intel' # x86_64
    uses: ./.github/workflows/build_macos_bin.yml
    with:
      macos_ver: ${{ matrix.macos_ver }}
    # secrets: inherit

  Windows:
    if: ${{ !contains(github.ref_name, 'event/') && github.event_name != 'schedule' && github.event.inputs.nightly != 'true' }}
    strategy:
      fail-fast: false
      matrix:
        windows_ver:
          - "2025" # x86_64
    uses: ./.github/workflows/build_windows_bin.yml
    with:
      windows_ver: ${{ matrix.windows_ver }}
    # secrets: inherit

  package-pio-deps-native-tft:
    if: ${{ github.repository == 'meshtastic/firmware' && github.event_name == 'workflow_dispatch' }}
    uses: ./.github/workflows/package_pio_deps.yml
    with:
      pio_env: native-tft
    secrets: inherit

  test-native:
    if: ${{ !contains(github.ref_name, 'event/') && github.repository == 'meshtastic/firmware' && github.event_name != 'schedule' && github.event.inputs.nightly != 'true' }}
    permissions: # Needed for dorny/test-reporter.
      contents: read
      actions: read
      checks: write
    uses: ./.github/workflows/test_native.yml

  build-wasm:
    if: ${{ !contains(github.ref_name, 'event/') && github.event_name != 'schedule' && github.event.inputs.nightly != 'true' }}
    # Build the WebAssembly portduino node ([env:native-wasm]) as part of normal CI,
    # like the other platforms. It's a dedicated job (not a row in the `build`
    # matrix) because its artifact is meshnode.{mjs,wasm} - not a flashable
    # .bin/.uf2/.hex - and it needs the Emscripten SDK; board_level=extra keeps
    # it out of generate_ci_matrix.py.
    uses: ./.github/workflows/build_portduino_wasm.yml

  docker:
    if: ${{ !contains(github.ref_name, 'event/') && github.event_name != 'schedule' && github.event.inputs.nightly != 'true' }}
    permissions: # Needed for pushing to GHCR.
      contents: read
      packages: write
    strategy:
      fail-fast: false
      matrix:
        distro: [debian, alpine]
        platform: [linux/arm64]
        pio_env: [native-tft]
    uses: ./.github/workflows/docker_build.yml
    with:
      distro: ${{ matrix.distro }}
      platform: ${{ matrix.platform }}
      runs-on: ${{ contains(matrix.platform, 'arm') && 'ubuntu-24.04-arm' || 'ubuntu-24.04' }}
      pio_env: ${{ matrix.pio_env }}
      push: false

  gather-artifacts:
    if: github.repository == 'meshtastic/firmware'
    strategy:
      fail-fast: false
      matrix:
        arch:
          - esp32
          - esp32s3
          - esp32c3
          - esp32c6
          - nrf52840
          - rp2040
          - rp2350
          - stm32
    runs-on: ubuntu-latest
    needs: [version, build]
    steps:
      - name: Checkout code
        uses: actions/checkout@v7

      - uses: actions/download-artifact@v8
        with:
          path: ./
          pattern: firmware-${{matrix.arch}}-*
          merge-multiple: true

      - name: Display structure of downloaded files
        run: ls -R

      - name: Repackage in single firmware zip
        uses: actions/upload-artifact@v7
        with:
          name: firmware-${{matrix.arch}}-${{ needs.version.outputs.long }}
          overwrite: true
          path: |
            ./firmware-*.mt.json
            ./firmware-*.bin
            ./firmware-*.uf2
            ./firmware-*.hex
            ./firmware-*.zip
            ./device-*.sh
            ./device-*.bat
            ./littlefs-*.bin
            ./bleota*bin
            ./mt-*-ota.bin
            ./Meshtastic_nRF52_factory_erase*.uf2
          retention-days: 30

      - uses: actions/download-artifact@v8
        with:
          name: firmware-${{matrix.arch}}-${{ needs.version.outputs.long }}
          merge-multiple: true
          path: ./output

      # For diagnostics
      - name: Show artifacts
        run: ls -lR

      - name: Device scripts permissions
        run: |
          chmod +x ./output/device-install.sh || true
          chmod +x ./output/device-update.sh || true

      - name: Zip firmware
        run: zip -j -9 -r ./firmware-${{matrix.arch}}-${{ needs.version.outputs.long }}.zip ./output

      - name: Repackage in single elfs zip
        uses: actions/upload-artifact@v7
        with:
          name: debug-elfs-${{matrix.arch}}-${{ needs.version.outputs.long }}
          overwrite: true
          path: ./*.elf
          retention-days: 30

  firmware-size-report:
    if: ${{ github.repository == 'meshtastic/firmware' && github.event_name != 'schedule' && github.event.inputs.nightly != 'true' }}
    continue-on-error: true
    permissions:
      contents: read
      actions: read
    runs-on: ubuntu-latest
    needs: [build]
    steps:
      - uses: actions/checkout@v7

      - name: Download current manifests
        uses: actions/download-artifact@v8
        with:
          path: ./manifests/
          pattern: manifest-*
          merge-multiple: true

      - name: Collect current firmware sizes
        run: python3 bin/collect_sizes.py ./manifests/ ./current-sizes.json

      - name: Upload size report artifact
        uses: actions/upload-artifact@v7
        with:
          name: firmware-sizes-${{ github.sha }}
          overwrite: true
          path: ./current-sizes.json
          retention-days: 90

      - name: Download baseline sizes from develop
        if: github.event_name == 'pull_request'
        continue-on-error: true
        id: baseline-develop
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          RUN_ID=$(gh run list -R "${{ github.repository }}" \
            --workflow CI --branch develop --status success \
            --limit 1 --json databaseId --jq '.[0].databaseId // empty')
          if [ -n "$RUN_ID" ]; then
            ARTIFACT_NAME=$(gh api "repos/${{ github.repository }}/actions/runs/${RUN_ID}/artifacts" \
              --jq '.artifacts[] | select(.name | startswith("firmware-sizes-")) | select(.expired == false) | .name' | head -1)
            if [ -n "$ARTIFACT_NAME" ]; then
              gh run download "$RUN_ID" -R "${{ github.repository }}" \
                --name "$ARTIFACT_NAME" --dir ./baseline-develop/
              cp "./baseline-develop/current-sizes.json" ./develop-sizes.json
              echo "found=true" >> "$GITHUB_OUTPUT"
            else
              echo "found=false" >> "$GITHUB_OUTPUT"
            fi
          else
            echo "found=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Download baseline sizes from master
        if: github.event_name == 'pull_request'
        continue-on-error: true
        id: baseline-master
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          RUN_ID=$(gh run list -R "${{ github.repository }}" \
            --workflow CI --branch master --status success \
            --limit 1 --json databaseId --jq '.[0].databaseId // empty')
          if [ -n "$RUN_ID" ]; then
            ARTIFACT_NAME=$(gh api "repos/${{ github.repository }}/actions/runs/${RUN_ID}/artifacts" \
              --jq '.artifacts[] | select(.name | startswith("firmware-sizes-")) | select(.expired == false) | .name' | head -1)
            if [ -n "$ARTIFACT_NAME" ]; then
              gh run download "$RUN_ID" -R "${{ github.repository }}" \
                --name "$ARTIFACT_NAME" --dir ./baseline-master/
              cp "./baseline-master/current-sizes.json" ./master-sizes.json
              echo "found=true" >> "$GITHUB_OUTPUT"
            else
              echo "found=false" >> "$GITHUB_OUTPUT"
            fi
          else
            echo "found=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Generate size comparison report
        if: github.event_name == 'pull_request'
        id: report
        run: |
          ARGS="./current-sizes.json --budgets bin/ram_budgets.json"
          if [ -f ./develop-sizes.json ]; then
            ARGS="$ARGS --baseline develop:./develop-sizes.json"
          fi
          if [ -f ./master-sizes.json ]; then
            ARGS="$ARGS --baseline master:./master-sizes.json"
          fi
          REPORT=$(python3 bin/size_report.py $ARGS)
          if [ -z "$REPORT" ]; then
            echo "has_report=false" >> "$GITHUB_OUTPUT"
          else
            echo "has_report=true" >> "$GITHUB_OUTPUT"
            {
              echo '<!-- firmware-size-report -->'
              echo '# Firmware Size Report'
              echo ''
              echo "$REPORT"
              echo ''
              echo '---'
              echo "*Updated for ${{ github.sha }}*"
            } > ./size-report.md
            cat ./size-report.md >> "$GITHUB_STEP_SUMMARY"
          fi

      - name: Save PR number
        if: github.event_name == 'pull_request' && steps.report.outputs.has_report == 'true'
        run: echo "${{ github.event.pull_request.number }}" > ./pr-number.txt

      - name: Upload size report
        if: github.event_name == 'pull_request' && steps.report.outputs.has_report == 'true'
        uses: actions/upload-artifact@v7
        with:
          name: size-report
          path: |
            ./size-report.md
            ./pr-number.txt
          retention-days: 5

  # RAM/flash guardrails: fails CI when an env listed in bin/ram_budgets.json
  # exceeds its static RAM (.data+.bss) or flash budget. Kept separate from
  # firmware-size-report, which is informational and continue-on-error.
  size-budget-gate:
    if: ${{ github.event_name != 'schedule' && github.event.inputs.nightly != 'true' }}
    permissions:
      contents: read
      actions: read
    runs-on: ubuntu-latest
    needs: [build]
    steps:
      - uses: actions/checkout@v7

      # No continue-on-error / empty-dir fallback: the gate must fail closed when
      # the data it enforces on cannot be fetched (size_report.py additionally
      # fails on missing budgeted envs under --enforce-budgets).
      - name: Download current manifests
        uses: actions/download-artifact@v8
        with:
          path: ./manifests/
          pattern: manifest-*
          merge-multiple: true

      - name: Collect current firmware sizes
        run: python3 bin/collect_sizes.py ./manifests/ ./current-sizes.json

      - name: Enforce RAM/flash budgets
        run: python3 bin/size_report.py ./current-sizes.json --budgets bin/ram_budgets.json --enforce-budgets

  release-artifacts:
    permissions: # Needed for 'gh release upload'.
      contents: write
    runs-on: ubuntu-latest
    if: ${{ github.event_name == 'workflow_dispatch' && github.repository == 'meshtastic/firmware' && github.event.inputs.nightly != 'true' }}
    outputs:
      upload_url: ${{ steps.create_release.outputs.upload_url }}
    needs:
      - setup
      - version
      - gather-artifacts
      - build-debian-src
      - package-pio-deps-native-tft
      # - MacOS
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          fetch-depth: 0

      - name: Setup Python
        uses: actions/setup-python@v6
        with:
          python-version: 3.x

      - name: Generate release notes
        id: release_notes
        run: |
          chmod +x ./bin/generate_release_notes.py
          NOTES=$(./bin/generate_release_notes.py ${{ needs.version.outputs.long }} --compare-ref HEAD 2>release_notes.log)
          echo "notes<<EOF" >> $GITHUB_OUTPUT
          echo "$NOTES" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT
          echo "### Release note range" >> $GITHUB_STEP_SUMMARY
          cat release_notes.log >> $GITHUB_STEP_SUMMARY
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Create release
        uses: softprops/action-gh-release@v3
        id: create_release
        with:
          draft: true
          prerelease: true
          name: Meshtastic Firmware ${{ needs.version.outputs.long }} Alpha
          tag_name: v${{ needs.version.outputs.long }}
          target_commitish: ${{ github.sha }}
          body: ${{ steps.release_notes.outputs.notes }}

      - name: Download source deb
        uses: actions/download-artifact@v8
        with:
          pattern: firmware-debian-${{ needs.version.outputs.deb }}~UNRELEASED-src
          merge-multiple: true
          path: ./output/debian-src

      - name: Download `native-tft` pio deps
        uses: actions/download-artifact@v8
        with:
          pattern: platformio-deps-native-tft-${{ needs.version.outputs.long }}
          merge-multiple: true
          path: ./output/pio-deps-native-tft

      - name: Zip Linux sources
        working-directory: output
        run: |
          zip -j -9 -r ./meshtasticd-${{ needs.version.outputs.deb }}-src.zip ./debian-src
          zip -9 -r ./platformio-deps-native-tft-${{ needs.version.outputs.long }}.zip ./pio-deps-native-tft

      # For diagnostics
      - name: Display structure of downloaded files
        run: ls -lR

      - name: Generate Release manifest
        run: |
          jq -n --arg ver "${{ needs.version.outputs.long }}" --argjson targets ${{ toJson(needs.setup.outputs.all) }} '{
            "version": $ver,
            "targets": $targets
          }' > firmware-${{ needs.version.outputs.long }}.json

      - name: Save Release manifest artifact
        uses: actions/upload-artifact@v7
        with:
          name: manifest-${{ needs.version.outputs.long }}
          overwrite: true
          path: firmware-${{ needs.version.outputs.long }}.json

      - name: Add sources to GitHub Release
        # Only run when targeting master branch with workflow_dispatch
        if: ${{ github.ref_name == 'master' }}
        run: |
          gh release upload v${{ needs.version.outputs.long }} ./firmware-${{ needs.version.outputs.long }}.json
          gh release upload v${{ needs.version.outputs.long }} ./output/meshtasticd-${{ needs.version.outputs.deb }}-src.zip
          gh release upload v${{ needs.version.outputs.long }} ./output/platformio-deps-native-tft-${{ needs.version.outputs.long }}.zip
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

  release-firmware:
    permissions: # Needed for 'gh release upload'.
      contents: write
    strategy:
      fail-fast: false
      matrix:
        arch:
          - esp32
          - esp32s3
          - esp32c3
          - esp32c6
          - nrf52840
          - rp2040
          - rp2350
          - stm32
    runs-on: ubuntu-latest
    if: ${{ github.event_name == 'workflow_dispatch' && github.repository == 'meshtastic/firmware' && github.event.inputs.nightly != 'true' }}
    needs: [release-artifacts, version]
    steps:
      - name: Checkout
        uses: actions/checkout@v7

      - name: Setup Python
        uses: actions/setup-python@v6
        with:
          python-version: 3.x

      - uses: actions/download-artifact@v8
        with:
          pattern: firmware-${{matrix.arch}}-${{ needs.version.outputs.long }}
          merge-multiple: true
          path: ./output

      - name: Display structure of downloaded files
        run: ls -lR

      - name: Device scripts permissions
        run: |
          chmod +x ./output/device-install.sh || true
          chmod +x ./output/device-update.sh || true

      - name: Zip firmware
        run: zip -j -9 -r ./firmware-${{matrix.arch}}-${{ needs.version.outputs.long }}.zip ./output

      - uses: actions/download-artifact@v8
        with:
          name: debug-elfs-${{matrix.arch}}-${{ needs.version.outputs.long }}
          merge-multiple: true
          path: ./elfs

      - name: Zip debug elfs
        run: zip -j -9 -r ./debug-elfs-${{matrix.arch}}-${{ needs.version.outputs.long }}.zip ./elfs

      # For diagnostics
      - name: Display structure of downloaded files
        run: ls -lR

      - name: Add bins and debug elfs to GitHub Release
        # Only run when targeting master branch with workflow_dispatch
        if: ${{ github.ref_name == 'master' }}
        run: |
          gh release upload v${{ needs.version.outputs.long }} ./firmware-${{matrix.arch}}-${{ needs.version.outputs.long }}.zip
          gh release upload v${{ needs.version.outputs.long }} ./debug-elfs-${{matrix.arch}}-${{ needs.version.outputs.long }}.zip
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

  publish-firmware:
    runs-on: ubuntu-24.04
    if: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.nightly != 'true' }}
    needs: [release-firmware, version]
    env:
      targets: |-
        esp32,esp32s3,esp32c3,esp32c6,nrf52840,rp2040,rp2350,stm32
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          fetch-depth: 0

      - name: Setup Python
        uses: actions/setup-python@v6
        with:
          python-version: 3.x

      - name: Get firmware artifacts
        uses: actions/download-artifact@v8
        with:
          pattern: firmware-{${{ env.targets }}}-${{ needs.version.outputs.long }}
          merge-multiple: true
          path: ./publish

      - name: Get manifest artifact
        uses: actions/download-artifact@v8
        with:
          pattern: manifest-${{ needs.version.outputs.long }}
          path: ./publish

      - name: Generate release notes
        run: |
          chmod +x ./bin/generate_release_notes.py
          ./bin/generate_release_notes.py ${{ needs.version.outputs.long }} --compare-ref HEAD > ./publish/release_notes.md
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Publish firmware to meshtastic.github.io
        uses: peaceiris/actions-gh-pages@v4
        env:
          # On event/* branches, use the event name as the destination prefix
          DEST_PREFIX: ${{ contains(github.ref_name, 'event/') && format('{0}/', github.ref_name) || '' }}
        with:
          deploy_key: ${{ secrets.DIST_PAGES_DEPLOY_KEY }}
          external_repository: meshtastic/meshtastic.github.io
          publish_branch: master
          publish_dir: ./publish
          destination_dir: ${{ env.DEST_PREFIX }}firmware-${{ needs.version.outputs.long }}
          keep_files: true
          user_name: github-actions[bot]
          user_email: github-actions[bot]@users.noreply.github.com
          commit_message: ${{ needs.version.outputs.long }}
          enable_jekyll: true

  # Nightly publish: refresh the single, stable firmware-nightly/ folder on
  # meshtastic.github.io with the current develop build. Runs on the cron schedule
  # (or a manual nightly=true dispatch) and never creates a GitHub release. The
  # folder's release_notes.md is maintained by hand and deliberately left untouched.
  publish-nightly:
    runs-on: ubuntu-24.04
    if: ${{ (github.event_name == 'schedule' || github.event.inputs.nightly == 'true') && github.repository == 'meshtastic/firmware' }}
    needs: [setup, version, gather-artifacts]
    env:
      targets: |-
        esp32,esp32s3,esp32c3,esp32c6,nrf52840,rp2040,rp2350,stm32
    steps:
      - name: Get firmware artifacts
        uses: actions/download-artifact@v8
        with:
          pattern: firmware-{${{ env.targets }}}-${{ needs.version.outputs.long }}
          merge-multiple: true
          path: ./stage

      - name: Generate Release manifest
        run: |
          jq -n --arg ver "${{ needs.version.outputs.long }}" --argjson targets ${{ toJson(needs.setup.outputs.all) }} '{
            "version": $ver,
            "targets": $targets
          }' > ./stage/firmware-${{ needs.version.outputs.long }}.json

      - name: Generate nightly pointer
        run: |
          jq -n \
            --arg ver "${{ needs.version.outputs.long }}" \
            --arg sha "${{ github.sha }}" \
            '{version: $ver, id: ("v" + $ver), title: ("Meshtastic Firmware " + $ver + " Nightly"), commit: $sha}' \
            > ./stage/index.json

      - name: Preserve manually-maintained release notes
        # firmware-nightly/release_notes.md is edited by hand. Carry the current
        # copy into ./stage so the keep_files:false publish (which refreshes the
        # folder and clears stale nightly binaries) does not drop it. Seed a
        # placeholder on the first run (404); fail closed on any other error so a
        # transient fetch failure never clobbers the notes.
        run: |
          set -euo pipefail
          url=https://raw.githubusercontent.com/meshtastic/meshtastic.github.io/master/firmware-nightly/release_notes.md
          code=$(curl -sSL -o ./stage/release_notes.md -w '%{http_code}' --retry 5 --retry-all-errors "$url" || echo 000)
          if [ "$code" = "200" ]; then
            echo "Preserved existing release_notes.md"
          elif [ "$code" = "404" ]; then
            echo "No existing release_notes.md; seeding placeholder"
            printf '# Nightly (develop)\n\nAutomated nightly build from the `develop` branch. Edit these notes by hand.\n' > ./stage/release_notes.md
          else
            echo "Unexpected HTTP $code fetching release_notes.md; refusing to publish to avoid clobbering manual notes"
            exit 1
          fi

      # For diagnostics
      - name: Display structure of files to publish
        run: ls -lR ./stage

      - name: Publish nightly to meshtastic.github.io
        uses: peaceiris/actions-gh-pages@v4
        with:
          deploy_key: ${{ secrets.DIST_PAGES_DEPLOY_KEY }}
          external_repository: meshtastic/meshtastic.github.io
          publish_branch: master
          publish_dir: ./stage
          # keep_files:false is scoped to destination_dir, so this refreshes only
          # firmware-nightly/ (clearing stale nightly binaries) while sibling
          # release folders stay untouched; release_notes.md is carried in above.
          destination_dir: firmware-nightly
          keep_files: false
          user_name: github-actions[bot]
          user_email: github-actions[bot]@users.noreply.github.com
          commit_message: Nightly ${{ needs.version.outputs.long }}
          enable_jekyll: true