Add checkout step to clear-cache.yml

Author: qqfunc

.github/workflows/clear-cache.yml

@@ -10,7 +10,9 @@ jobs:
     name: Clear cache
     runs-on: ubuntu-latest
 
-    steps:
+    steps:
+    - name: Checkout ${{ github.repository }}
+      uses: actions/checkout@v4
     - name: Clear all cache
       run: gh cache delete -a
       env: