[BLD] deploy preview of docs in PRs

.github/workflows/pr.yml

@@ -23,6 +23,35 @@ jobs:
             outside-docs:
               - '!docs/**'
               - '!.github/**'
+            docs:
+              - 'docs/**'
+
+  deploy-docs-preview:
+    name: Deploy preview of docs
+    needs: paths-filter
+    #if: needs.paths-filter.outputs.docs == 'true'
+    runs-on: ubuntu-latest
+    environment:
+      name: Preview
+      url: ${{ steps.deploy.outputs.url }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-node@v3
+        with:
+          node-version: "18.x"
+          registry-url: "https://registry.npmjs.org"
+      - name: Install vercel
+        run: npm install -g vercel
+      - name: Deploy
+        id: deploy
+        run: echo "url=$(vercel deploy --token ${{ secrets.VERCEL_TOKEN }})" >> $GITHUB_OUTPUT
+        env:
+          VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+          VERCEL_PROJECT_ID: ${{ secrets.VERCEL_DOCS_PROJECT_ID }}
+
 
   python-tests:
     name: Python tests