The arch job was the one still paying full freight every run: ~1 GB of
pacman across its two install steps (never cached — container layers die
with the job) and cold cargo builds (arch was skipped in the sccache
rollout). punktfunk-arch-ci bakes base-devel + both makepkg legs' deps +
bun + node + sccache; the in-job installs become --needed no-op guards for
the one push where :latest lags. Rolling-release note in the Dockerfile:
packages now build against the image's snapshot, the same staleness the
gamescope cache already embraces, re-snapshotted on any ci/ edit.
sccache reaches makepkg by crossing the sudo boundary explicitly —
env_reset strips ambient env, so the wrapper env rides the existing
`sudo -u builder env ...` list.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
