Fuse GRUB configuration into the EFI binary

Value

Updating two files in a safe, transactional manner is way, way harder than updating one. By having the grub.cfg file built-into GRUB binary we can avoid a lot of complexity without limiting anything relevant.

Description

Configure GRUB to have a built-in config file identical to the one we currently build in the oniro-grub-bootconf recipe. The existing file may "stay" if it is unused and this makes things easier for wic integration. Make sure to create a cleanup task if this happens.

In scope

Out of Scope

Acceptance Criteria

Applicable Market Segments

Applicable Personas

set weight to 3

added to epic &10

changed milestone to %goofy alpha

changed iteration to Oniro Core Iterations May 1, 2022 - May 31, 2022

assigned to @zyga

added teamota label

mentioned in issue sysota#8

changed iteration to Oniro Core Iterations Jun 1, 2022 - Jun 30, 2022

changed milestone to %goofy beta

removed iteration Oniro Core Iterations Jun 1, 2022 - Jun 30, 2022

changed milestone to %goofy general availability

assigned to @kzarka

changed epic to &167

The issue is handled by MR !381

added Doing label