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.github/workflows/build.yml

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+name: Build and Release ESP32 Firmware
+
+on:
+  push:
+    branches: [ "main", "master" ]
+    tags:
+      - "v*.*.*"  # v1.0.0 や v0.1.0 などのタグが Push された時にトリガー
+  pull_request:
+    branches: [ "main", "master" ]
+  workflow_dispatch:
+
+# Release 作成権限を付与
+permissions:
+  contents: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # arduino-cli と ESP32 コアのセットアップ
+      - name: Setup Arduino CLI
+        uses: esp-cpp/setup-arduino-cli@v1
+        with:
+          index-url: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
+          platforms: esp32:esp32@2.0.14
+
+      # 依存ライブラリのインストール
+      - name: Install ESP32-A2DP library
+        run: arduino-cli lib install "ESP32-A2DP"
+
+      # コンパイル実行
+      - name: Compile Sketch
+        run: |
+          arduino-cli compile \
+            --fqbn esp32:esp32:esp32 \
+            --build-property "build.partitions=huge_app" \
+            --build-property "upload.maximum_size=3145728" \
+            firmware/firmware.ino
+
+      # 通常の Artifacts 保存 (毎回実行)
+      - name: Upload Build Artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: esp32-a2dp-firmware
+          path: |
+            firmware/build/esp32.esp32.esp32/*.bin
+
+      # GitHub Release の自動作成 & アセット添付 (タグ Push 時のみ実行)
+      - name: Create GitHub Release
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            firmware/build/esp32.esp32.esp32/firmware.ino.bin
+            firmware/build/esp32.esp32.esp32/firmware.ino.bootloader.bin
+            firmware/build/esp32.esp32.esp32/firmware.ino.partitions.bin
+          generate_release_notes: true

firmware/firmware.ino

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+#include "BluetoothA2DPSink.h"
+
+BluetoothA2DPSink a2dp_sink;
+
+void setup() {
+    // I2S ピンアサインの設定 (必要に応じてご自身の基板に合わせて変更)
+    i2s_pin_config_t my_pin_config = {
+        .bck_io_num = 27,
+        .ws_io_num = 25,
+        .data_out_num = 26,
+        .data_in_num = I2S_PIN_NO_CHANGE
+    };
+    a2dp_sink.set_pin_config(my_pin_config);
+    a2dp_sink.start("MyESP32Speaker");
+}
+
+void loop() {
+}