Bump git backup action to v0.0.4 (#8)

* Bump git backup action to v0.0.4

* Do not trigger the backup action with pr

.github/workflows/backup.yml

@@ -4,9 +4,6 @@ on:
   push:
     branches:
     - master
-  pull_request:
-    branches: 
-    - master
 
 jobs:
   git-repo-backup:
@@ -14,12 +11,12 @@ jobs:
     steps:
     - uses: actions/checkout@master
     - name: Backup to gitee
-      uses: jenkins-zh/git-backup-actions@master
+      uses: jenkins-zh/git-backup-actions@v0.0.4
       env:
         GIT_DEPLOY_KEY: ${{ secrets.GIT_DEPLOY_KEY }}
         TARGET_GIT: "git@gitee.com:jenkins-zh/jenkins-open-tutorial.git"
     - name: Backup to CodeChina
-      uses: jenkins-zh/git-backup-actions@master
+      uses: jenkins-zh/git-backup-actions@v0.0.4
       env:
         GIT_DEPLOY_KEY: ${{ secrets.GIT_DEPLOY_KEY }}
         TARGET_GIT: "git@codechina.csdn.net:jenkins-zh/jenkins-open-tutorial.git"