When a test script fails in CI, it's often difficult to pinpoint the
exact line in the log where the script failed and the cleanup() function
(trapped on EXIT) begins.
Adding a prominent line (with greenprint where available) at the start
of the cleanup function will make reading logs of failed jobs a lot
easier.
RHEL 9.0 will ship a brand new auxiliary key. Let's use it everywhere in our
RHEL 9 stuff. Taken from current RHEL 9.0's redhat-release package.
Signed-off-by: Ondřej Budai <ondrej@budai.cz>
This test provisions a RHEL-8.6 VM locally, installs osbuild-composer on
it, upgrades the system to RHEL-9.0 and verifies osbuild-composer still
works by building a simple qcow image.
