Each PR gets tested by the commitlint app (which is deprecated). On
occasion the app does not pickup the change in a PR, and the only way to
start a retest is to re-push the PR. All tests will then get executed
again, even if only commitlint was needed.
The new commitlint CI job introduces '/retest commitlint' and runs in
the CentOS CI like other Jenkins jobs. However, the job does not start
automatically on each (updated) PR, but needs manual starting with the
'/test commitlint' or '/retest commitlint' comments. The normal way of
running commitlint is with the app (at least for now).
Signed-off-by: Niels de Vos <ndevos@redhat.com>