mkosi config for image builds

To build a Rawhide image:

$ sudo mkosi

or if you prefer to build an image for a specific release:

$ sudo mkosi --release 37

This assumes you have mkosi installed, if not

$ sudo dnf install mkosi

Note that the currently released mkosi version (mkosi 13) cannot build this config successfully, so you'll want to run the latest git main branch instead until a new one is released.

If you're not building on aarch64, you'll also want

$ sudo dnf install qemu-user-static-aarch64