feat: implement CI/CD with testing and building

.github/workflows/firebase-hosting-merge.yml

@@ -10,9 +10,26 @@ jobs:
   build_and_deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - run: flutter build web
-      - uses: FirebaseExtended/action-hosting-deploy@v0
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.19.0'
+          channel: stable
+
+      - name: Install dependencies
+        run: flutter pub get
+
+      - name: Run tests
+        run: flutter test
+
+      - name: Build Flutter Web
+        run: flutter build web --release
+
+      - name: Deploy to Firebase Hosting
+        uses: FirebaseExtended/action-hosting-deploy@v0
         with:
           repoToken: ${{ secrets.GITHUB_TOKEN }}
           firebaseServiceAccount: ${{ secrets.FIREBASE_SERVICE_ACCOUNT_WESALAPP_BC676 }}