Add grub and refind back

"rescue/installation actions for {grub,refind} should be run from
within a chroot" is a false statement. See --boot-directory of
grub-install and --root of refind-install. (In the case of grub,
there are people that do not use the ugly grub-mkconfig at all.)
9 jobs for grub_refind in 98 minutes and 6 seconds (queued for 4 seconds)
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