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The chroot's /dev only gains fd/stdin/stdout/stderr symlinks at boot, and
container executors often lack them, which breaks mkinitcpio's preset step
(pipes through /dev/stdin) and bash process substitution
("/dev/fd/63: No such file or directory").
- build-iso workflow: create the links in the executor's /dev, then mount a
fresh devtmpfs and create them there too so the chroot tree is covered
whether the executor's /dev is devtmpfs or a plain tmpfs
- customize_airootfs.sh: self-heal the same links inside the chroot