Add GitHub Actions workflow for Flutter debug build

Author: awoni

.github/workflows/android_build.yml

@@ -0,0 +1,57 @@
+name: Android Build CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v4
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+
+      - name: Cache Flutter dependencies
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.pub-cache
+          key: ${{ runner.os }}-flutter-${{ hashFiles('myapp/pubspec.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-flutter-
+
+      - name: Install dependencies
+        run: flutter pub get
+        working-directory: myapp
+
+      - name: Analyze project source
+        run: flutter analyze
+        working-directory: myapp
+
+      - name: Run tests
+        run: flutter test
+        working-directory: myapp
+
+      - name: Build debug APK
+        run: flutter build apk --debug
+        working-directory: myapp
+
+      - name: Upload debug APK artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: debug-apk
+          path: myapp/build/app/outputs/flutter-apk/app-debug.apk