bisector: Use PrivateTmp=true with systemd-run
Allows having a private bind mount of /tmp for the process tree, that is then cleaned up when the scope unit is deleted.
GitLab Maintenance scheduled for Thursday, 18th December 2025, from 7:00 AM to 10:00 AM BST. GitLab will be in read-only mode and experience short periods of complete downtime (up to 20 minutes) during this window.
Allows having a private bind mount of /tmp for the process tree, that is then cleaned up when the scope unit is deleted.