Builds the ISO a pull request produces, installs it unattended in a KVM
guest on a GitHub-hosted runner, boots the installed system again, and
writes the install time per phase plus first-boot and everyday-boot
systemd-analyze to the job summary. Every later installer change is
measured against these numbers in its own PR.
Locally against the 2026-10-04 quattro ISO: install 51.3 s (42.9 s of
it pacstrap), first boot 12.1 s, everyday boot 11.7 s with ~6 s in the
loader, systemd running, no failed units.
A disk check replaces a cleanup step: the runner has ~86 GB free, so
the 2-minute "Free Disk Space" action the nightly uses is not needed.
Emir Beganovic
1ad8872146