build: Automatic build of Android apks for release

.github/workflows/github_release.yml

@@ -0,0 +1,58 @@
+name: Build split apks and attach to release
+
+on:
+  release:
+    types:
+      - created
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v3
+
+    - uses: actions/setup-java@v2
+      with:
+        distribution: 'zulu'
+        java-version: '11'
+
+    - name: Set up Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        flutter-version: '3.13.6'
+
+    - name: Install dependencies
+      run: flutter pub get
+
+    - name: Configure Keystore for Android
+      run: |
+        echo "$PLAY_STORE_UPLOAD_KEY" | base64 --decode > app/upload-keystore.jks
+        echo "storeFile=upload-keystore.jks" >> key.properties
+        echo "keyAlias=$KEYSTORE_KEY_ALIAS" >> key.properties
+        echo "storePassword=$KEYSTORE_STORE_PASSWORD" >> key.properties
+        echo "keyPassword=$KEYSTORE_KEY_PASSWORD" >> key.properties
+      env:
+        PLAY_STORE_UPLOAD_KEY: ${{ secrets.PLAY_STORE_UPLOAD_KEY }}
+        KEYSTORE_KEY_ALIAS: ${{ secrets.KEYSTORE_KEY_ALIAS }}
+        KEYSTORE_KEY_PASSWORD: ${{ secrets.KEYSTORE_KEY_PASSWORD }}
+        KEYSTORE_STORE_PASSWORD: ${{ secrets.KEYSTORE_STORE_PASSWORD }}
+      working-directory: android
+
+    - name: Build APK
+      run: flutter build apk --split-per-abi
+
+    - name: Rename output files
+      run: |
+        mv "build/app/outputs/flutter-apk/app-armeabi-v7a-release.apk" "build/app/outputs/flutter-apk/openreads-${{ github.event.release.tag_name }}-armeabi-v7a-release.apk"
+        mv "build/app/outputs/flutter-apk/app-arm64-v8a-release.apk" "build/app/outputs/flutter-apk/openreads-${{ github.event.release.tag_name }}-arm64-v8a-release.apk"
+        mv "build/app/outputs/flutter-apk/app-x86_64-release.apk" "build/app/outputs/flutter-apk/openreads-${{ github.event.release.tag_name }}-x86_64-release.apk"
+        
+    - name: Attach apk files
+      uses: softprops/action-gh-release@v1
+      with:
+        files: |
+          build/app/outputs/flutter-apk/openreads-${{ github.event.release.tag_name }}-armeabi-v7a-release.apk
+          build/app/outputs/flutter-apk/openreads-${{ github.event.release.tag_name }}-arm64-v8a-release.apk
+          build/app/outputs/flutter-apk/openreads-${{ github.event.release.tag_name }}-x86_64-release.apk