Add input allowing to override the channel that's used for hassio image
downloads and in runtime for Supervisor updates, building on the option added
in #3618.
The new default is dev for dev builds, for GH releases keep using the stable
channel both for releases and pre-releases (so we could catch any stable issues
before beta is moved to stable).
To keep it DRY and idiomatic, create a new in-repo GH action for running
commands in the build container.
* Add HA Yellow image to RPi Imager index update action
Update the action to also bump HA Yellow image added in
home-assistant/version#402.
* Sync image name with the current JSON PR
Automate bump of the rpi-imager-haos.json in the version repository on
stable release so we don't have to do it manually. Uses slightly
advanced jq magic to touch only the changed fields and keep the rest of
the JSON content intact.