Print lint warnings #2788

Job	Run time
prepare	1s
test / prepare	5m 33s
test / run (containerd, ./frontend/dockerfile, integration)	5m 17s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 18s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	6m 3s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	5m 53s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 43s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	5m 59s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 52s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 23s
test / run (oci, ./frontend/dockerfile, integration)	4m 53s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 14s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 14s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 17s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 56s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	6m 46s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 30s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 14s
image (mainline)	4m 58s
image (labs)	5m 9s
release	0s
	1h 42m 13s

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