gummiboot: split *.efi.stub into subpackage

[jirutka]

dracut-uefi and mkinitcpio (since upcoming v31) needs UEFI stub from gummiboot (or systemd, which is the same; systemd has absorbed gummiboot) to bundle Linux kernel and initramdisk into a UEFI executable - and only the stub, not gummiboot bootloader itself, nor any hooks.

Have the results of the proposed changes been tested?

• I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
• I generally don't use the affected packages but briefly tested this PR

[ericonr]

Why would someone not want the full package?

And if we want to merge this PR, it should also include a fix to dracut-uefi to depend on the new subpackage.

[jirutka]

Why would someone not want the full package?

Because you don’t need any bootloader to boot Linux from UEFI. However, to fully utilize SecureBoot, it’s needed to bundle Linux kernel and initramdisk into a single UEFI executable; there’s where *.efi.stub file from the gummiboot package is needed (and only the efi stub, not the gummiboot bootloader).

And if we want to merge this PR, it should also include a fix to dracut-uefi to depend on the new subpackage.

Yeah, you’re right, I’m gonna added it now.

[jirutka]

Pushed and I also updated the commit/PR description to make it more clear.

[ericonr]

LGTM otherwise, thanks