Merge pull request #5427 from thompson-shaun/update-dockerfile-ref-arg #41

Job	Run time
prepare	1s
test / prepare	3m 59s
test / run (containerd, ./frontend/dockerfile, integration)	4m 43s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 47s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	5m 5s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 56s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 36s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 29s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 49s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	7m 0s
test / run (oci, ./frontend/dockerfile, integration)	4m 18s
test / run (oci, ./frontend/dockerfile, dockerfile)	6m 26s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 30s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 34s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 34s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 22s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 22s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 2s
image (mainline)	4m 46s
image (labs)	4m 47s
release	0s
scout	0s
	1h 42m 6s

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