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configs/releng/profiledef.sh: change UEFI boot loader from GRUB to systemd-boot

nl6720 requested to merge nl6720/archiso:die-grub-die into master

While using GRUB as the UEFI boot loader has reduced the size of the ISO, it has brought nothing but pain otherwise:

  • We cannot use gfxterm since it is not visible on some hardware.
  • GRUB has a a strange and nonsensical limitation where the EFI binary can be built with either support for shim or custom Secure Boot key support, but not both. This means you cannot repack the ISO to use shim + MOK since we currently use --disable-shim-lock to provide support for setups with custom keys.
  • GRUB's EFI binary needs to be built with grub-mkstandalone instead of there being a ready made EFI binary in the package. This requires having grub installed on the host system which affects reproducibility.

This increases the size of the ISO since systemd-boot cannot boot files from other volumes, i.e. the kernel and initramfs is duplicated in the EFI system partition (the second partition made from efiboot.img).

Implements #227 (closed)

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