Update pages build job

Signed-off-by: Jing Chen <jing.chen2@ibm.com>

Author: jgchn

.github/workflows/publish.yaml

@@ -22,6 +22,8 @@ jobs:
         with:
           source: ./
           destination: ./_site
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
       - name: Deploy to GitHub Pages
         id: deployment
         uses: actions/deploy-pages@v4