There's a stanza in .cirrus.yml that only "runs" in
the treadmill cron job ... but that job is long gone.
The task actually runs in the buildah treadmill PR, #13808,
but that's not obvious to someone reading .cirrus.yml.
This is a maintenance burden. Remove it.
Because rootless bud tests are still important, and we
still want to run them in the treadmill PR, modify the
treadmill script itself so it (ugh) injects rootless jobs
into the buildah_bud test matrix. This is super fragile
but acceptable because I am the only one who ever runs
the treadmill script. I will notice if this breaks.
Signed-off-by: Ed Santiago <santiago@redhat.com>