During installation, /usr/lib/kernel/install.d/50-dracut.install
generate initramfs in $BOOT_DIR_ABS. It is important to use that one,
even if there is one in /boot/initramfs-*.img already, because it was
generated later and contains all required config files (including
keyboard layout for entering LUKS passphrase).
This fixes d1f3be0eed "kernel-install:
avoid creating initramfs multiple times".
FixesQubesOS/qubes-issues#3234