[Merge] ~waveform/meta-release:pi500 into meta-release:main

[Dave Jones]

FYI, the core-docs branch merge is this one: https://code.launchpad.net/~waveform/meta-release/+git/meta-release/+merge/477243 which fixes up the CI failure that this ran into
-- 
https://code.launchpad.net/~waveform/meta-release/+git/meta-release/+merge/478085
Your team Ubuntu Core Development Team is subscribed to branch meta-release:main.