Sporadic test failures with sqlite: no such table: django_rq_queue

[finsterwalder]

We have a big test suite in our django project. We use django-rq.
Sometimes, when we run the tests (usually on our gitlab ci), the tests fail with the error:
django.db.utils.OperationalError: no such table: django_rq_queue

The don't always fail. It's more a 10% to 20% chance of failure.

Any ideas what's going on?