Set fetch depth to 0 to pull history to fix hugo lastmod

Author: nginx-jack

.github/workflows/docs-build-push.yml

@@ -169,6 +169,8 @@ jobs:
 
       - name: Checkout docs content
         uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.7.1
+        with:
+          fetch-depth: 0 # This is required for hugo Lastmod to function properly
 
       - name: Get latest hugo theme
         if: inputs.doc_type == 'hugo' && inputs.force_hugo_theme_version == ''