String substitution in variable expansion #1838

Job	Run time
prepare	1s
test / prepare	1m 55s
test / run (containerd, ./frontend/dockerfile, integration)	4m 24s
test / run (containerd, ./frontend/dockerfile, dockerfile)	5m 42s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 11s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	5m 46s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 12s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 0s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 27s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 50s
test / run (oci, ./frontend/dockerfile, integration)	3m 46s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 26s
test / run (oci-rootless, ./frontend/dockerfile, integration)	3m 43s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	4m 44s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	3m 58s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 28s
image (mainline)	5m 1s
image (labs)	4m 40s
release	0s
	1h 19m 14s

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