[Docs Site] Post Workers preview URL on PRs (cloudflare#19670)

Author: thienbho

.github/workflows/publish-preview.yml

@@ -57,12 +57,3 @@ jobs:
           path: |
             node_modules/.astro
           key: static
-          
-  keepalive:
-    runs-on: ubuntu-latest
-    permissions:
-      actions: write
-      contents: read
-    steps:
-      - uses: actions/checkout@v4
-      - uses: gautamkrishnar/keepalive-workflow@v2