Add Flutter SDK

Author: onevdog

.github/workflows/build.yml

@@ -13,16 +13,15 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: dart-lang/setup-dart@v1
+      - uses: subosito/flutter-action@v1
+        with:
+            channel: 'stable'
 
       - name: Install dependencies
         run: flutter pub get
 
-      # Consider passing '--fatal-infos' for slightly stricter analysis.
       - name: Analyze project source
-        run: dart analyze --fatal-infos
+        run: flutter analyze --fatal-infos
 
-      # Your project will need to have tests in test/ and a dependency on
-      # package:test for this step to succeed. Note that Flutter projects will
-      # want to change this to 'flutter test'.
       - name: Run tests
         run: flutter test