[Docs Site] Fix fetch-depth and last updated on pages with updated fm (cloudflare#19070)

Author: thienbho

.github/workflows/publish-preview.yml

@@ -46,3 +46,12 @@ 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