Handle comments correctly for preview PR docs (#94)

Signed-off-by: Tao He <[email protected]>

.github/workflows/docs.yml

@@ -18,9 +18,11 @@ on:
   push:
     branches:
       - main
-  pull_request:
+  pull_request_target:
     branches:
       - main
+      - docs
+      - dev/docs
 
 jobs:
   build:
@@ -29,10 +31,29 @@ jobs:
       matrix:
         os: [ubuntu-20.04]
     steps:
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+
       - uses: actions/checkout@v2
         with:
           submodules: true
 
+      - name: Leave the comment on pull request when started
+        if: ${{ github.event_name == 'pull_request_target' }}
+        uses: actions-cool/maintain-one-comment@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            ⚡️ Deploying PR Preview ${{ github.event.pull_request.head.sha }} to [surge.sh](https://alibaba-graphar-build-pr-${{ github.event.number }}.surge.sh) ... [Build logs](https://github.com/alibaba/GraphAr/runs/${{ github.run_id }})
+
+            <a href="https://github.com/alibaba/GraphAr/actions/runs/${{ github.run_id }}">
+              <img width="300" src="https://user-images.githubusercontent.com/507615/90240294-8d2abd00-de5b-11ea-8140-4840a0b2d571.gif">
+            </a>
+
+            <sub>🤖 By [surge-preview](https://surge.sh/)</sub>
+          body-include: '<!-- Sticky Pull Request Comment: Surge Preview build -->'
+
       - name: Install dependencies
         run: |
           sudo apt-get update -y
@@ -47,17 +68,43 @@ jobs:
           make doc
           popd
 
-      - name: preview
-        uses: afc163/surge-preview@v1
-        id: preview_step
+      - name: Preview using surge
+        if: ${{ github.event_name == 'pull_request_target' && github.repository == 'alibaba/GraphAr' }}
+        run: |
+          npm install -g surge
+          surge ./docs/_build/html \
+                alibaba-graphar-build-pr-${{ github.event.number }}.surge.sh \
+                --token ${{ secrets.SURGE_TOKEN }}
+
+      - name: Leave the comment on pull request when succeed
+        if: ${{ github.event_name == 'pull_request_target' }}
+        uses: actions-cool/maintain-one-comment@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            🎊 PR Preview ${{ github.event.pull_request.head.sha }} has been successfully built and deployed to https://alibaba-graphar-build-pr-${{ github.event.number }}.surge.sh
+
+            <a href="https://github.com/alibaba/GraphAr/actions/runs/${{ github.run_id }}">
+              <img width="300" src="https://user-images.githubusercontent.com/507615/90250366-88233900-de6e-11ea-95a5-84f0762ffd39.png">
+            </a>
+
+            <sub>🤖 By [surge-preview](https://surge.sh/)</sub>
+          body-include: '<!-- Sticky Pull Request Comment: Surge Preview build -->'
+
+      - name: Leave the comment on pull request when failed
+        if: ${{ failure() && github.event_name == 'pull_request_target' }}
+        uses: actions-cool/maintain-one-comment@v3
         with:
-          surge_token: ${{ secrets.SURGE_TOKEN }}
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          dist: docs/_build/html
-          build: echo "done"
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            😭 Deploy PR Preview ${{ github.event.pull_request.head.sha }} failed. [Build logs](https://github.com/alibaba/GraphAr/runs/${{ github.run_id }})
+
+            <a href="https://github.com/alibaba/GraphAr/actions/runs/${{ github.run_id }}">
+              <img width="300" src="https://user-images.githubusercontent.com/507615/90250824-4e066700-de6f-11ea-8230-600ecc3d6a6b.png">
+            </a>
 
-      - name: Get the preview_url
-        run: echo "url => ${{ steps.preview_step.outputs.preview_url }}"
+            <sub>🤖 By [surge-preview](https://surge.sh/)</sub>
+          body-include: '<!-- Sticky Pull Request Comment: Surge Preview build -->'
 
       - name: Commit Doc
         if: ${{ github.ref == 'refs/heads/main' && github.repository == 'alibaba/GraphAr' }}