add android sdk as an additional step

.gitea/workflows/build-android.yaml

@@ -12,7 +12,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: https://github.com/actions/setup-java@v4
       with:
-        java-version: '12'
+        java-version: '17'
         distribution: 'zulu'
     - uses: https://github.com/subosito/flutter-action@v2
       with:
@@ -20,6 +20,8 @@ jobs:
         flutter-version: 3.19.6
         cache: true
     - run: flutter config --no-cli-animations
+    - name: Setup Android SDK
+      uses: https://github.com/android-actions/setup-android@v3
     - run: flutter pub get -v
     # - run: flutter test
     - run: flutter build apk --debug --split-per-abi