chore: update deploy.yml (doocs#2445)

Author: yanglbme

.github/workflows/deploy.yml

@@ -59,6 +59,11 @@ jobs:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./site
 
+  sync:
+    runs-on: ubuntu-latest
+    needs: deploy
+    if: github.repository == 'doocs/leetcode'
+    steps:
       - name: Sync to gitee.com
         uses: wearerequired/git-mirror-action@master
         env:
@@ -73,4 +78,4 @@ jobs:
             gitee-username: yanglbme
             gitee-password: ${{ secrets.GITEE_PASSWORD }}
             gitee-repo: doocs/leetcode
-            branch: gh-pages
+            branch: gh-pages