Resolves: rhbz#2011877
Enabled all tests:
- Copied script from RHEL 8.6.0 branch.
- Added nightly RHEL 9.0 repositories.
- Don't install EPEL for RHEL 9.0: Koji and Ansible aren't required for
any of the enabled tests.
Unmount /tmp before running tests:
/tmp is too small to contain the results of image building tests.
Unmounting the partition makes it part of the underlying root partition,
which is much larger.