systemd-boot-manager: INITRD_ENTRIES not handled in script but very much needed

[v1993]

This variable seems super useful for Booster users, as it does not support bundling microcode into initramfs images and devs explicitly suggest that the solution is to use your boot loader's functionality instead (in case of systemd-boot, add an initrd /cpuvendor-ucode.img entry before the main initrd entry); however, it's completely absent from the sdboot-manage script and thus does nothing. I had to manually tweak the script locally to insert the relevant line, but that's obviously a terrible idea in the long run.

I'm aware this does not affect the default installation, but since there's already support for non-mkinitcpio initramfs images with specific mention of Booster, it seems that properly supporting it is desirable - and being able to apply microcode updates is most definitely a part of that.

P.S.: https://github.com/CachyOS/systemd-boot-manager probably should be archived with a link here, as it seems that development moved to this repo.

[ventureoo]

Are there any other use cases for such option besides microcode?

[ventureoo]

Is #469 working fine for you?

[v1993]

Yep, just tested and it works great! As far as I'm aware, microcode updates are the only common use of this feature.