The hook package install inside the pacstrap chroot may silently skip
the initcpio install step under QEMU emulation, leaving the archiso hook
absent from the initrd (confirmed: no 'running late hook [archiso]' in
boot output despite UUID match on device).
Explicitly copy /usr/lib/initcpio/hooks/archiso and install/archiso from
the build host into the airootfs before mkarchiso runs mkinitcpio, so
the hook is present regardless of how the chroot package install behaves.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
nmemmertandClaude Sonnet 4.6
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