[bug#68524] [PATCH v2 2/2] gnu: bootloaders: Add uefi-uki-bootloader.

[Lilah Tascheter]

> * add secure-boot-cert and secure-boot-key fields to bootloader-
> configuration.
>
> * deprecate configuration-file and configuration-file-generator in
>   the bootloader struct, and instead create an install-configuration-file
>   field, similar to install-bootloader. default procedure will be to do the
>   current install-boot-cfg (gnu build install) using the deprecated fields.
>
> * rework uki.scm to, instead, run efibootmgr in install-
>   configuration-file and install the uki.efi files in install-bootloader.
>   remove the separation between uefi-uki-signed-bootloader and
>   uefi-uki-bootloader, instead working off the new bootloader-configuration
>   fields.

amending: also edit the bootloader-installer and bootloader-disk-image-installer
procedures to provide the bootloader-configuration in some manner.

lilah