The function was defined but never called, resulting in immediate exit
of the maintenance script. Fix this, also add a configuration build-arg and
ENV to control the cleaning interval.
Signed-off-by: Chris Evich <chris_gitlab@icuc.me>
When given the "run" argument, in addition to launching `podman system
service` in the background, also start a small periodic maintenance
script. It's only job is to clean up stale images, containers, and
volumes from old jobs. Currently hard-coded to trigger every 2 days,
this could be tweaked via build-args or env. var.
Signed-off-by: Chris Evich <cevich@redhat.com>
