Let's make sure we're testing with the latest changes in mkosi. This
includes both the switch to systemd-repart and ukify, making sure we
get extra testing coverage for those components.
This also drops options from the centos config that have been removed
in the newer mkosi.
For some reason idmapping runs into some issues so we disable it for
now.
These are only needed for some kernel selftests but they prevent
building the mkosi image on aarch64 systems so let's drop them
until mkosi has support for conditional configuration so we can
only add these packages on the right architecture.
Once mkosi migrates to systemd-repart, only "disk" will be supported
for making disk images with mkosi and the filesystem will have to be
specified in repart partition definition files. To accomodate this
change, let's remove the explicit Format= assignment which means we'll
default to a disk image with ext4 until we add our own mkosi.repart/
directory.
mkfs.vfat doesn't support specifying a root directory to bootstrap
the filesystem from (see https://github.com/dosfstools/dosfstools/issues/183).
Instead, we can use the mcopy tool from the mtools package to copy
files into the vfat filesystem after creating it without needing to
mount the vfat filesystem.
