Updated workflow.

Author: xulinfeng

.github/workflows/dart.yml

@@ -16,5 +16,5 @@ jobs:
         channel: 'stable'
     - run: flutter pub get
     - run: flutter test
-    - run: cd ./example && flutter build ios --simulator
+    - run: cd ./example && flutter build ios --simulator -t lib/ios.dart && flutter build apk -t lib/android.dart