Merge pull request #4815 from tonistiigi/overlay-size-fix #2769

Job	Run time
prepare	1s
test / prepare	2m 0s
test / run (containerd, ./frontend/dockerfile, integration)	4m 31s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 51s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 44s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	5m 44s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 37s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 26s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 51s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 47s
test / run (oci, ./frontend/dockerfile, integration)	4m 7s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 24s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 31s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	4m 59s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 4s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 7s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 28s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 41s
image (mainline)	5m 3s
image (labs)	5m 27s
release	0s
	1h 36m 23s

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