📝 docs: support preview (#7204)

* 📝 docs: support preview

* change dist dir

* add umi-plugin-pro install

* Update .github/workflows/preview.yml

Co-authored-by: 偏右 <afc163@gmail.com>

Co-authored-by: 偏右 <afc163@gmail.com>

.github/workflows/preview.yml

@@ -0,0 +1,18 @@
+name: 🔂 Surge PR Preview
+
+on: [push]
+
+jobs:
+  preview:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: afc163/surge-preview@v1
+        with:
+          surge_token: ${{ secrets.SURGE_TOKEN }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          build: |
+            npm install
+            npm install umi-plugin-pro --save
+            npm run build
+          dist: dist