[WIP] testing updated snapshotters #5261

Job	Run time
prepare	1s
test / prepare	2m 0s
test / run (containerd, ./frontend/dockerfile, integration)	4m 58s
test / run (containerd, ./frontend/dockerfile, dockerfile)	7m 6s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 58s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	7m 18s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	5m 2s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	7m 41s
test / run (containerd-1.7, ./frontend/dockerfile, integration)	5m 40s
test / run (containerd-1.7, ./frontend/dockerfile, dockerfile)	7m 31s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	6m 32s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	7m 41s
test / run (oci, ./frontend/dockerfile, integration)	4m 41s
test / run (oci, ./frontend/dockerfile, dockerfile)	6m 13s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 29s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	6m 10s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	5m 1s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	6m 8s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 42s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 13s
image (mainline)	5m 29s
image (labs)	5m 50s
release	0s
scout	0s
	2h 1m 24s

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