chore: Checkout repo before running test

Author: Techassi

.github/workflows/nightly-test.yml

@@ -12,6 +12,9 @@ jobs:
     name: Run integration tests
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+        with:
+          submodules: recursive
       - name: Run tests (not)
         uses: stackabletech/actions/run-integration-test@run-integration-test
         with: