ci: Create dart-analyze.yml

See: https://github.com/ValentinVignal/action-dart-analyze

.github/workflows/dart-analyze.yml

@@ -0,0 +1,23 @@
+name: Dart Analyze
+
+on:
+  push:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  linter:
+    runs-on: ubuntu-latest
+    name: Lint flutter code
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Set up Flutter
+      uses: subosito/flutter-action@v1
+    - run: bash -x ./flutter-init.sh
+    - run: cp -f ./src/ui/flutter_app/analysis_options.yaml ./
+    - name: Analyze Flutter
+      uses: ValentinVignal/action-dart-analyze@v0.11
+      with:
+        fail-on: 'format'
+        working-directory: src/ui/flutter_app