* Use rauc hook to extend compatible for upcomming OS release 6
In the OS release 6 the OS (HASSOS_ID) will be renamed to haos. The
variable is used to generate the image file name, OS name in os-release
as well as OS compatible string for RAUC updates.
Furthermore intel-nuc will be renamed to generic-x86-64.
To be able to downgrade from a release 6 installation back to release 5,
we need to make release 5 update bundles work with a release 6 system.
Use a custom install-check hook which checks the full compatible as well
as compatible strings which check against the new compatible strings.
* Fix shellcheck issues
0ba64629e8