Update dart.yml

-name: Dart CI
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
+name: Run analyze and tests
+on: pull_request
 jobs:
 jobs:
-  build:
-
+  analyze-and-test:
     runs-on: ubuntu-latest
     runs-on: ubuntu-latest
-
-    container:
-      image:  google/dart:latest
-
     steps:
     steps:
-    - uses: actions/checkout@v2
-    - name: Install dependencies
-      run: pub get
-    - name: Run tests
-      run: pub run test
+      - uses: actions/checkout@v1
+      - uses: actions/setup-java@v1
+        with:
+          java-version: '12.x'
+      - uses: subosito/flutter-action@v1
+        with:
+          channel: 'stable'
+      - run: flutter pub get
+      - run: flutter build aot
+      - run: flutter analyze
+      - run: flutter test