Initial purpose of treadmill PR was to run buildah-bud tests
early, and not run anything else if they fail. This was to
catch vendoring problems and not be distracted by flakes.
This was done by inspecting and massaging .cirrus.yml.
As of #21639 this code was a silent NOP because the entire
CI tree was overhauled. Here we make that work again.
Also, in #20947 I enhanced this script to run rootless
bud tests but neglected to updated the comments. Do so now.
Signed-off-by: Ed Santiago <santiago@redhat.com>
9db04e87b6