Update checkout branch.

Signed-off-by: Jay Zhang <jiz@microsoft.com>

.github/workflows/main.yml

@@ -15,6 +15,8 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+        with:
+          path: migrate_ci
 
       # Call the composite action defined in my-action.yml
-      - uses: ./.github/workflows/setup.yml@migrate_ci
+      - uses: ./.github/workflows/setup.yml