dockerfile: use lld linker for containerd build #4942

Job	Run time
prepare	1s
test / prepare	5m 9s
test / run (containerd, ./frontend/dockerfile, integration)	4m 48s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 44s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 41s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 42s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	5m 6s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 46s
test / run (containerd-1.7, ./frontend/dockerfile, integration)	4m 47s
test / run (containerd-1.7, ./frontend/dockerfile, dockerfile)	7m 27s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 18s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	7m 12s
test / run (oci, ./frontend/dockerfile, integration)	4m 48s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 45s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 23s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 47s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 20s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 44s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 56s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 19s
image (mainline)	5m 34s
image (labs)	5m 34s
scout	0s
release	0s
	1h 57m 51s

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