doc: modify ci_be

Author: Linchen-Xu

.github/workflows/ci_be.yml

@@ -65,5 +65,6 @@ jobs:
       - name: Commit & Push changes to Readme
         uses: actions-js/push@master
         with:
+          branch: ${{ github.ref_name }}
           message: Update coverage on Readme
           github_token: ${{ secrets.GITHUB_TOKEN }}