The content in RDO tends to get updated frequenty, and this sometimes
causes unexpected change during tests.
Let's make sure that repo file is not updated during tests, so that
we don't get failure caused by broken idempotency.
Depends-on: https://review.opendev.org/#/c/752594/
Change-Id: I88bee4f7f2c9f5a4178ba41b5f1ed3c8e818e1c3