A unit test run stopped before it began: Docker Hub refused to hand out archlinux:latest, "You have reached your unauthenticated pull rate limit". GitHub's runners share addresses, so the limit is not ours to stay under. Arch publishes the same image as ghcr.io/archlinux/archlinux, which has no such limit from a runner. The three workflow containers and the ISO build's own container pull it from there.