Merge pull request #5356 from jsternberg/vtproto #4541

Job	Run time
prepare	1s
test / prepare	8m 40s
test / run (containerd, ./frontend/dockerfile, integration)	7m 2s
test / run (containerd, ./frontend/dockerfile, dockerfile)	25m 43s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	7m 10s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	12m 20s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	6m 56s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	12m 44s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	7m 53s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	14m 37s
test / run (oci, ./frontend/dockerfile, integration)	6m 30s
test / run (oci, ./frontend/dockerfile, dockerfile)	11m 47s
test / run (oci-rootless, ./frontend/dockerfile, integration)	6m 26s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	11m 23s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	6m 20s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	11m 52s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	6m 38s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	11m 53s
image (mainline)	5m 29s
image (labs)	5m 36s
scout (master)	32s
release	0s
scout (master-labs)	24s
	3h 7m 56s

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