Add a banner on startup when DEBUG_MUTE is enabled (#8402)

src/main.cpp

@@ -436,6 +436,12 @@ void setup()
 
     LOG_INFO("\n\n//\\ E S H T /\\ S T / C\n");
 
+#if defined(DEBUG_MUTE) && defined(DEBUG_PORT)
+    DEBUG_PORT.printf("\r\n\r\n//\\ E S H T /\\ S T / C\r\n");
+    DEBUG_PORT.printf("Version %s for %s from %s\r\n", optstr(APP_VERSION), optstr(APP_ENV), optstr(APP_REPO));
+    DEBUG_PORT.printf("Debug mute is enabled, there will be no serial output.\r\n");
+#endif
+
     initDeepSleep();
 
 #if defined(MODEM_POWER_EN)