Update mr.yml

Author: tongyiming

.github/workflows/mr.yml

@@ -27,8 +27,8 @@ jobs:
       # Runs a set of commands using the runners shell
       - name: MR INFO
         run: |
-          git pull --rebase origin master
-          
+          git fetch origin master
+          git branch --show-current
           export TF_ACC=true
           export TENCENTCLOUD_REGION=ap-guangzhou
           export TENCENTCLOUD_SECRET_KEY=${{ secrets.TENCENTCLOUD_SECRET_KEY }}