ci: add pr preview

.github/workflows/preview-build.yml

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+name: Preview Build
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  build-preview:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+      - uses: c-hive/gha-yarn-cache@v2
+
+      - name: build
+        run: |
+          yarn
+          NODE_OPTIONS='--max-old-space-size=4096' yarn build
+
+      - run: |
+          zip -r docs.zip docs
+
+      - name: upload dist artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: docs
+          path: docs.zip
+          retention-days: 5
+
+      - name: Save PR number
+        if: ${{ always() }}
+        run: echo ${{ github.event.number }} > ./pr-id.txt
+
+      - name: Upload PR number
+        if: ${{ always() }}
+        uses: actions/upload-artifact@v2
+        with:
+          name: pr
+          path: ./pr-id.txt

.github/workflows/preview-deploy.yml

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+name: Preview Deploy
+
+on:
+  workflow_run:
+    workflows: ["Preview Build"]
+    types:
+      - completed
+
+jobs:
+  success:
+    runs-on: ubuntu-latest
+    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
+    steps:
+      - name: download pr artifact
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          workflow: ${{ github.event.workflow_run.workflow_id }}
+          name: pr
+
+      - name: save PR id
+        id: pr
+        run: echo "::set-output name=id::$(<pr-id.txt)"
+
+      - name: download dist artifact
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          workflow: ${{ github.event.workflow_run.workflow_id }}
+          workflow_conclusion: success
+          name: docs
+      - run: |
+          unzip docs.zip
+      - name: upload surge service
+        id: deploy
+        run: |
+          export DEPLOY_DOMAIN=https://vant-react-native-preview-pr-${{ steps.pr.outputs.id }}.surge.sh
+          npx surge --project ./docs --domain $DEPLOY_DOMAIN --token ${{ secrets.SURGE_TOKEN }}
+      - name: update status comment
+        uses: actions-cool/maintain-one-comment@v1.1.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            🎊 PR Preview has been successfully built and deployed to https://vscode-api-cn-preview-pr-${{ steps.pr.outputs.id }}.surge.sh
+
+            <img width="300" src="https://user-images.githubusercontent.com/507615/90250366-88233900-de6e-11ea-95a5-84f0762ffd39.png">
+            <!-- Sticky Pull Request Comment -->
+          body-include: '<!-- Sticky Pull Request Comment -->'
+          number: ${{ steps.pr.outputs.id }}
+      - run: |
+          rm -rf docs/
+      - name: The job failed
+        if: ${{ failure() }}
+        uses: actions-cool/maintain-one-comment@v1.1.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            😭 Deploy PR Preview failed.
+            <img width="300" src="https://user-images.githubusercontent.com/507615/90250824-4e066700-de6f-11ea-8230-600ecc3d6a6b.png">
+            <!-- Sticky Pull Request Comment -->
+          body-include: '<!-- Sticky Pull Request Comment -->'
+          number: ${{ steps.pr.outputs.id }}
+
+  failed:
+    runs-on: ubuntu-latest
+    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'failure'
+    steps:
+      - name: download pr artifact
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          workflow: ${{ github.event.workflow_run.workflow_id }}
+          name: pr
+
+      - name: save PR id
+        id: pr
+        run: echo "::set-output name=id::$(<pr-id.txt)"
+
+      - name: The job failed
+        uses: actions-cool/maintain-one-comment@v1.1.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            😭 Deploy PR Preview failed.
+            <img width="300" src="https://user-images.githubusercontent.com/507615/90250824-4e066700-de6f-11ea-8230-600ecc3d6a6b.png">
+            <!-- Sticky Pull Request Comment -->
+          body-include: '<!-- Sticky Pull Request Comment -->'
+          number: ${{ steps.pr.outputs.id }}

.github/workflows/preview-start.yml

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+name: Preview Start
+
+on: pull_request_target
+
+jobs:
+  preview:
+    runs-on: ubuntu-latest
+    steps:
+      - name: create
+        uses: actions-cool/maintain-one-comment@v1.1.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            ⚡️ Deploying PR Preview...
+            <img src="https://user-images.githubusercontent.com/507615/90240294-8d2abd00-de5b-11ea-8140-4840a0b2d571.gif" width="300" />
+            <!-- Sticky Pull Request Comment -->
+          body-include: '<!-- Sticky Pull Request Comment -->'