dockerfile: use lld linker for containerd build #4941

Job	Run time
prepare	1s
test / prepare	5m 35s
test / run (containerd, ./frontend/dockerfile, integration)	4m 56s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 45s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	5m 7s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 38s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 53s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 39s
test / run (containerd-1.7, ./frontend/dockerfile, integration)	5m 23s
test / run (containerd-1.7, ./frontend/dockerfile, dockerfile)	7m 17s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 30s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	7m 16s
test / run (oci, ./frontend/dockerfile, integration)	4m 45s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 58s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 21s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 39s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 44s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 54s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 18s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 8s
image (mainline)	5m 28s
image (labs)	5m 9s
scout	0s
release	0s
	1h 58m 24s

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