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.)

@tomty89 can you please rebase your branch on current master? The CI can then also show us how much the overall size increase is :)

added 14 commits

• 4f2befb6...6cd4a64c - 13 commits from branch archlinux:master
• 2f88ba3c - Add grub and refind back

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changed milestone to %v59

added scopeenhancement label

resolved all threads

merged