Ki/fix checkout code in workflow (#201)

* chore: update runner tags, as self-hopsted runners are not available in mattrglobal

* chore: use script directly instead of reusable action

* chore: add checkout step to assurance workflow

.github/workflows/github_clone_assurance.yaml

@@ -13,6 +13,9 @@ jobs:
       contents: read
       id-token: write
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
       - name: mirror repo
         shell: bash
         run: |