Merge pull request #48856 from thaJeztah/copyloopvar #104

Job	Run time
validate-dco / run	18s
build	2m 5s
test (dockerd, client, integration)	19m 5s
test (dockerd, cmd/buildctl, integration)	6m 52s
test (dockerd, solver, integration)	7m 5s
test (dockerd, frontend, integration)	6m 50s
test (dockerd, frontend/dockerfile, integration)	26m 40s
test (dockerd-containerd, client, integration)	21m 5s
test (dockerd-containerd, cmd/buildctl, integration)	6m 56s
test (dockerd-containerd, solver, integration)	6m 42s
test (dockerd-containerd, frontend, integration)	6m 53s
test (dockerd-containerd, frontend/dockerfile, integration)	28m 0s
	2h 18m 31s

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