[CI] Add release workflow

.github/workflows/flutter_release_build.yml

@@ -0,0 +1,73 @@
+name: Flutter Release Build CI
+
+on:
+  release:
+    types: [prereleased]
+
+permissions:
+  contents: write
+
+env:
+  FLUTTER_VERSION: "3.24.3"
+
+jobs:
+  build-android-debug:
+    runs-on: ubuntu-latest
+
+    env:
+      APK_NAME: Blink_Comparison-${{ github.event.release.tag_name }}-debug.apk
+
+    outputs:
+      versionNum: ${{ steps.apk-info.outputs.versionNum }}
+      versionCode: ${{ steps.apk-info.outputs.versionCode }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: "temurin"
+          java-version: "17"
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: ${{ env.FLUTTER_VERSION }}
+      - name: Disable Google Analytics
+        run: flutter config --no-analytics
+      - name: Install dependencies
+        run: flutter pub get
+      - name: Build debug Android APK
+        id: build
+        run: |
+          flutter build apk --flavor base --debug
+          cd build/app/outputs/flutter-apk/
+          mv app-base-debug.apk "$APK_NAME"
+          echo "assets-path=build/app/outputs/flutter-apk" >> "$GITHUB_OUTPUT"
+      - name: Extract APK version code
+        id: apk-info
+        uses: 8Mi-Tech/get-apk-info-action@master
+        with:
+          apkPath: ${{ steps.build.outputs.assets-path }}/${{ env.APK_NAME }}
+
+  generate-metadata-assets:
+    runs-on: ubuntu-latest
+
+    needs: [build-android-debug]
+
+    env:
+      VERSION_FILE: version.txt
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Create assests
+        env:
+          ANDROID_BUILD_NAME: ${{ needs.build-android-debug.outputs.versionNum }}
+          ANDROID_BUILD_NUMBER: ${{ needs.build-android-debug.outputs.versionCode }}
+        run: |
+          echo "android-build-name=$ANDROID_BUILD_NAME" >> $VERSION_FILE
+          echo "android-build-number=$ANDROID_BUILD_NUMBER" >> $VERSION_FILE
+      - name: Upload assets
+        uses: softprops/action-gh-release@v2
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          prerelease: true
+          files: |
+            ${{ env.VERSION_FILE }}