Build and push to docker hub

.github/workflows/main_matrix.yml

@@ -334,6 +334,23 @@ jobs:
             release/device-*.bat
           retention-days: 30
       
+      - name: Docker login
+        uses: docker/login-action@v2
+        with: 
+          username: meshtastic
+          password: ${{ secrets.DOCKER_TOKEN }}
+
+      - name: Docker setup
+        uses: docker/setup-buildx-action@v2
+
+      - name: Docker build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: meshtastic/device:simulator
+
   after-checks:
     runs-on: ubuntu-latest
     needs: [check]