Tests: Ensure that all ostree commits produce valid bare-user-only repos

In particular the non-canonical checks were failing for me due to selinux
attributes being picked up.

Closes: #1698
Approved by: alexlarsson
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f