ci.yml: add format and codecov

Author: Sergey Khomushin

.github/workflows/ci.yml

@@ -32,13 +32,14 @@ jobs:
       - name: Install dependencies
         run: flutter pub get
 
-      # Uncomment this step to verify the use of 'dart format' on each commit.
-      # - name: Verify formatting
-      #   run: dart format --output=none --set-exit-if-changed .
+      - name: Verify formatting
+        run: dart format --output=none --set-exit-if-changed .
 
-      # Consider passing '--fatal-infos' for slightly stricter analysis.
       - name: Analyze project source
-        run: flutter analyze
+        run: flutter analyze --fatal-infos
 
       - name: Run tests
         run: flutter test --coverage
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3