deploy gh pages

Author: ueman

.github/workflows/web-example.yml

@@ -0,0 +1,16 @@
+name: Flutter Web Example GH-Pages
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: subosito/flutter-action@v1
+      - uses: erickzanardo/flutter-gh-pages@v2
+        with:
+          workingDir: example