Add GitHub Actions workflow for Pages PR preview

.github/workflows/pages-preview.yml

@@ -0,0 +1,40 @@
+name: Pages PR Preview
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+      contents: read
+      pull-requests: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/configure-pages@v5
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: .
+      - uses: actions/deploy-pages@v4
+        id: deployment
+        if: github.event_name == 'push'
+      - name: Comment PR with preview artifact link
+        if: github.event_name == 'pull_request'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: '📦 Pages preview artifact built. Download from the [Actions run](' + context.serverUrl + '/' + context.repo.owner + '/' + context.repo.repo + '/actions/runs/' + context.runId + ') to preview locally.'
+            })