ci: add build-android action

.github/workflows/build-android.yml

@@ -0,0 +1,40 @@
+name: Flutter Build APK
+
+on:
+  push:
+    branches:
+      - main  # Change this to the branch you want to trigger the action
+  pull_request:
+    branches:
+      - main  # Change this to the branch you want to trigger on PR
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up JDK
+      uses: actions/setup-java@v2
+      with:
+        java-version: '11'  # Use the required Java version for your project
+
+    - name: Install Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        flutter-version: 'stable'  # or a specific version, e.g., '3.10.5'
+
+    - name: Install dependencies
+      run: flutter pub get
+
+    - name: Build APK
+      run: flutter build apk --release  # Add any additional flags you need
+
+    - name: Archive APK
+      uses: actions/upload-artifact@v3
+      with:
+        name: flutter-apk
+        path: build/app/outputs/flutter-apk/app-release.apk  # Adjust this path if necessary
+