Switch from checkout to clone

.github/workflows/mirror.yml

@@ -9,7 +9,7 @@ jobs:
   mirror:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - run: git clone https://github.com/${{ github.repository }} .
       - run: git remote add gitlab https://gitlab.com/code0-tech/docs.git
       - run: >-
           git