Use git init + fetch instead of clone

.gitea/workflows/ci.yml

@@ -8,9 +8,11 @@ jobs:
     steps:
       - name: Checkout
         run: |
-          if [ ! -f setup.py ]; then
+          rm -rf * .gitignore 2>/dev/null || true
-            git clone https://gitea.com/7000pctAUTO/json-to-openapi .
+          git init
-          fi
+          git remote add origin https://gitea.com/7000pctAUTO/json-to-openapi
+          git fetch
+          git checkout main
       - name: Install
         run: |
           python3 -m ensurepip --upgrade 2>/dev/null || true