gitlab-02 running out of disk space in gitlab-shared

GitLab is running out of disk space again.

something happened in the last month that made it eat 100GB in about 3 weeks:

https://grafana.torproject.org/d/zbCoGRjnz/disk-usage?orgId=1&var-class=All&var-instance=gitlab-02.torproject.org&from=now-90d&to=now

even more visible in the yearly:

https://grafana.torproject.org/d/zbCoGRjnz/disk-usage?orgId=1&var-class=All&var-instance=gitlab-02.torproject.org&from=now-1y&to=now

our daily rate is 6.65GB which means we have slightly more than 48h before running out of disk completely (15GB remaining)

battle plan:

• @lavamind figure out a short term fix
  • erase artifacts in projects under tpo/web/l10n + disable "Keep latest artifacts"
  • erase artifacts in gabi-205/arti (22GB) + disable "Keep latest artifacts"
  • deal with storage used by tpo/core/debian/tor (39GB)
• @anarcat make a ticket to move artifacts to minio, possibly growing minio in the process (#41403)
• emergency procedures
  • vacuum pipelines
  • donate backup drive to shared
  • move to MinIO (#41403)