feat: add pr preview ci

.github/workflows/preview.yml

@@ -0,0 +1,41 @@
+name: Preview webui
+
+on:
+  pull_request_target:
+    paths:
+      - 'webui/**'
+    types: [opened, synchronize, reopened, closed]
+
+jobs:
+  preview:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+
+      - name: Install dependencies
+        run: |
+          cd webui/
+          npm install
+
+      - name: Build webui
+        run: |
+          cd webui/
+          npm run build
+
+      - uses: afc163/surge-preview@v1
+        id: preview_step
+        with:
+          surge_token: ${{ secrets.SURGE_TOKEN }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          teardown: 'true'
+          dist: webui/build
+          build: |
+            echo "dummy"
+
+      - name: Get the preview_url
+        run: echo "url => ${{ steps.preview_step.outputs.preview_url }}"