archutil: refactor generation and validation #2367

Job	Run time
prepare	2s
test / prepare	1m 50s
test / run (containerd, ./frontend/dockerfile, integration)	4m 23s
test / run (containerd, ./frontend/dockerfile, dockerfile)	5m 47s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 21s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 6s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 23s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	5m 46s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 45s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 11s
test / run (oci, ./frontend/dockerfile, integration)	4m 13s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 13s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 2s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 6s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 9s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 6s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	6m 0s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 43s
image (mainline)	4m 43s
image (labs)	4m 39s
release	0s
	1h 32m 28s

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