Implement update for GRUB boot assets

Value

Ability to update GRUB EFI binaries in the field.

Description

The GRUB binary is outside of the A/B system image which is updated by the current system. We need a way to update that binary in order to address inevitable bugs and new feature requirements.

In scope

• New specifications for where to get boot assets for x86
• Possible changes to the raspberry pi boot assets location
• New features for applying boot assets (without A/B logic)
• New tests
• New documentation

Out of Scope

• A/B updates for boot assets

Acceptance Criteria

GRUB binary can be updated correctly.

Applicable Market Segments

Applicable Personas

added to epic &10

changed the description

added teamota label

set weight to 5

changed milestone to %goofy alpha

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

I will attempt to complete this in April but it may slip. It will involve some new mechanics we didn't have before.

assigned to @zyga

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

This will slip to May as I need to tackle oniro#523 before this is useful.

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

changed milestone to %goofy beta

changed epic to &167