fix: shallow update not allowed

.github/workflows/backup.yml

@@ -12,6 +12,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0  # Fetch all history for all branches and tags
 
       - name: Set up Git
         run: |
@@ -26,4 +28,3 @@ jobs:
         run: |
           git push -u gitea --all --force
           git push -u gitea --tags --force
-