feature: add CI

.github/workflows/main.yml

@@ -0,0 +1,37 @@
+name: Flutter CI
+
+# This workflow is triggered on pushes to the repository.
+on:
+  push:
+    branches:
+    - main
+    
+jobs:
+  build:
+    # This job will run on ubuntu virtual machine
+    runs-on: ubuntu-latest
+    steps:
+    
+    # Setup Java environment in order to build the Android app.
+    - uses: actions/checkout@v3.0.2
+    - uses: actions/setup-java@v3.4.0
+      with:
+        java-version: 11
+        distribution: temurin
+    
+    # Setup the flutter environment.
+    - uses: subosito/flutter-action@v2.4.0
+      with:
+        channel: 'stable' # 'dev', 'alpha', default to: 'stable'
+        cache: true
+        # flutter-version: '1.22.x' # you can also specify exact version of flutter
+    
+    # Get flutter dependencies.
+    - run: flutter pub get
+    
+    # Check for any formatting issues in the code.
+    - run: flutter format .
+    
+    # Statically analyze the Dart code for any errors.
+    - run: flutter analyze .
+