* installation: Instruct users to disable secureboot with virt-manager
Modern distros ship a variety of UEFI binaries and selecting a secureboot one leads to an un-bootable VM as there are no secure-boot keys enrolled by default for the home-assistant OS.
Note explicitly that virt-manager users should pick the non-secureboot variant.
* Add secboot
Co-authored-by: Fabian Affolter <mail@fabian-affolter.ch>