Use managed GitHub token for configured credentials for bundle preview

Author: mlr

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

@@ -16,7 +16,7 @@ jobs:
       - name: Configure Git Credentials
         uses: de-vri-es/setup-git-credentials@v2
         with:
-          credentials: ${{ secrets.GIT_CREDENTIALS }}
+          credentials: https://${{ secrets.DOCS_GITHUB_PAT }}@github.com
 
       - name: Checkout Repository
         uses: actions/checkout@v4