WIP: switch composefs-boot to use bootc-kernel-cmdline #493

Job	Run time
build (bls, rhel9)	8m 2s
build (uki, fedora)	7m 45s
build (uki, arch)	7m 18s
build (bls, rawhide)	7m 43s
build (bls, fedora-compat)	7m 44s
build (bls, arch)	6m 12s
build (unified, fedora)	9m 29s
build (bls, arch, ext4, none)	6m 25s
build (bls, fedora)	6m 29s
build (bls, arch, xfs, none)	5m 34s
build (unified-secureboot, fedora)	9m 22s
	1h 22m 3s

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