Add flutter build to CI

.drone.yml

@@ -72,12 +72,31 @@ steps:
   - ls -lah target/release/moneymgr_backend target/release/examples/api_curl
   - cp target/release/moneymgr_backend target/release/examples/api_curl /tmp/release
 
+# Mobile app
+- name: mobile_app
+  image: ghcr.io/cirruslabs/flutter:latest
+  volumes:
+  - name: release
+    path: /tmp/release
+  depends_on:
+  - backend_test
+  - web_build
+  commands:
+  - cd moneymgr_mobile
+  - flutter --disable-analytics
+  - flutter pub get --enforce-lockfile
+  - dart run build_runner build
+  - flutter analyze
+  - flutter build apk --release --split-per-abi
+  - cp build/app/outputs/flutter-apk/app-arm64-v8a-release.apk /tmp/release/moneymgr_mobile_arm64-v8a.apk
+
 
 # Release
 - name: gitea_release
   image: plugins/gitea-release
   depends_on:
   - backend_build
+  - mobile_app
   when:
     event:
       - tag