Merge pull request google#207 from google/workflow/gh-pages

github pages workflow fix

Author: kapv89

.github/workflows/gh-pages.yaml

@@ -15,6 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
         with:
+          ref: gh-pages
           submodules: true  # Fetch Hugo themes (true OR recursive)
           fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod