Only publish for main branch

Author: melix

.github/workflows/gradle.yml

@@ -70,6 +70,7 @@ jobs:
 
       - name: Deploy to GH Pages 🚀
         uses: peaceiris/actions-gh-pages@v3
+        if: ${{ github.ref == 'refs/heads/main' }}
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: build/graph