Boot test for x86_64 poky build
I want to use spread to boot test the image we get out of the build system, so that we have an open path to test additional images (e.g. arm images) with either specific qemu (e.g. aarch64) or later on, muxpi (though neither is supported by spread yet).
Depends on custom disk image support https://git.ostc-eu.org/planning/testing/-/issues/2 This may depend on custom qemu executable support: https://git.ostc-eu.org/planning/testing/-/issues/3
Once those is available, should be simple, assuming our image has SSH support.
This brings us closer to https://git.ostc-eu.org/planning/requirements/-/issues/1