Replace manual git operations for gh-pages branch with checkout step

Author: mlr

.github/workflows/deploy-bundle-preview.yml

@@ -84,13 +84,16 @@ jobs:
           body-includes: UI bundle preview build successful!
           direction: last
 
+      - name: Checkout gh-pages Branch
+        uses: actions/checkout@v3
+        with:
+          token: ${{ secrets.DOCS_GITHUB_PAT }}
+          ref: gh-pages
+          path: pages
+
       - name: Deploy to GitHub Pages
         if: success()
         run: |
-          git clone https://x-access-token:${{ secrets.DOCS_GITHUB_PAT }}@github.com/$GITHUB_REPOSITORY.git pages
-          cd pages
-          git checkout gh-pages
-
           # If there was previously a build for the preview, then remove it
           # so we get a clean build. This is needed in case a follow up
           # build of the same pull request contains content deletions.