[Fix] The deployment issue.

Author: mumupika

.github/workflows/deploy.yml

@@ -26,6 +26,7 @@ jobs:
   deploy:
     needs: build
     runs-on: ubuntu-latest
+    if: github.repository == 'cppdoc-cc/cppdoc'
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}