👷 add gh-pages action (#1418)

.github/workflows/github-pages.yml

@@ -0,0 +1,20 @@
+name: Qiankun Github Pages Deploy
+on:
+  push:
+    branches:
+      - master
+jobs:
+  deploy-gh-pages:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: build
+        run: |
+          yarn
+          yarn docs:build
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./dist