Build images with Hybrid BIOS+UEFI Boot Support

https://fedoraproject.org/wiki/Changes/FedoraCloudHybridBoot

We likely need to tweak GRUB on the ESP as describe here: https://fedoraproject.org/wiki/Changes/UnifyGrubConfig.

• https://github.com/osbuild/osbuild/blob/5828da8d6205801a8bdea8a8279db5c4bd49bc80/stages/org.osbuild.grub2#L234-L245