Merge pull request #49241 from vvoland/runtime-numcpu #741

Job	Run time
validate-dco / run	19s
build	2m 39s
test (dockerd, client, integration)	17m 7s
test (dockerd, cmd/buildctl, integration)	8m 22s
test (dockerd, solver, integration)	8m 30s
test (dockerd, frontend, integration)	8m 29s
test (dockerd, frontend/dockerfile, integration)	22m 25s
test (dockerd-containerd, client, integration)	18m 21s
test (dockerd-containerd, cmd/buildctl, integration)	8m 41s
test (dockerd-containerd, solver, integration)	8m 38s
test (dockerd-containerd, frontend, integration)	8m 17s
test (dockerd-containerd, frontend/dockerfile, integration)	23m 39s
	2h 15m 27s

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