Print lint warnings #2815

Job	Run time
prepare	1s
test / prepare	1m 44s
test / run (containerd, ./frontend/dockerfile, integration)	4m 33s
test / run (containerd, ./frontend/dockerfile, dockerfile)	5m 55s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 28s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	5m 46s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 43s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	7m 24s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 7s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	7m 55s
test / run (oci, ./frontend/dockerfile, integration)	4m 13s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 14s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 27s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 4s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 30s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 2s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 21s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 21s
image (mainline)	4m 46s
image (labs)	4m 47s
release	0s
	1h 35m 21s

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