WIP: switch composefs-boot to use bootc-kernel-cmdline #494

Job	Run time
build (bls, fedora-compat)	7m 30s
build (uki, arch)	7m 11s
build (uki, fedora)	8m 54s
build (bls, rhel9)	6m 22s
build (unified, fedora)	7m 31s
build (bls, fedora)	6m 30s
build (bls, arch, ext4, none)	6m 38s
build (bls, arch, xfs, none)	4m 57s
build (unified-secureboot, fedora)	8m 14s
build (bls, arch)	6m 3s
build (bls, rawhide)	5m 54s
	1h 15m 44s

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