Merge pull request #4712 from tonistiigi/idmap-unpack #4

Job	Run time
prepare	1s
test / prepare	1m 53s
test / run (containerd, ./frontend/dockerfile, integration)	4m 36s
test / run (containerd, ./frontend/dockerfile, dockerfile)	5m 47s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 46s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	5m 26s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 21s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	5m 48s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	6m 7s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 8s
test / run (oci, ./frontend/dockerfile, integration)	4m 3s
test / run (oci, ./frontend/dockerfile, dockerfile)	4m 57s
test / run (oci-rootless, ./frontend/dockerfile, integration)	3m 57s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 18s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 9s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	4m 47s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 8s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 25s
image (mainline)	4m 39s
image (labs)	4m 36s
release	0s
	1h 30m 52s

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