The so-called artifacts (files generated by CI/CD jobs) pile up. They constitute more than half of the storage space of this Gitlab project. The expiry time for job artifacts is not set in `.gitlab-ci.yml`, which would normally mean that it uses the expiry time set by the Gitlab instance. Seemingly, this instance does not set an expiry time. *Suggested solution*:\ Set an expiry time in `.gitlab-ci.yml`. The "default" time of 30 days should be workable. The existing job artifacts (generated till now) shall be deleted.