Update main.yml

Author: softmarshmallow

.github/workflows/main.yml

@@ -16,8 +16,9 @@ jobs:
           channel: 'dev'
       - run: flutter config --enable-web
       - run: flutter pub get
-      - run: cd example
-      - run: flutter build web --release
+      - run: |
+          cd example
+          flutter build web --release
       - run: |
           cd build/web
           git init