force checkout

Author: KentoNishi

.github/workflows/publish.yaml

@@ -36,7 +36,7 @@ jobs:
         mkdocs build
         mv site ../site
         git fetch --all
-        git checkout gh-pages
+        git checkout gh-pages -f
         cp -r ../site/* .
     - name: Deploy Docs
       uses: EndBug/add-and-commit@v7