Custom inline cache implementation #241

Job	Run time
prepare	1s
test / prepare	1m 41s
test / run (containerd, ./frontend/dockerfile, integration)	4m 4s
test / run (containerd, ./frontend/dockerfile, dockerfile)	2m 33s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	3m 37s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	2m 38s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 11s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	2m 43s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	3m 21s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	2m 53s
test / run (oci, ./frontend/dockerfile, integration)	3m 8s
test / run (oci, ./frontend/dockerfile, dockerfile)	2m 27s
test / run (oci-rootless, ./frontend/dockerfile, integration)	3m 47s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	2m 26s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	3m 21s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	2m 23s
image	0s
release	0s
	45m 14s

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