Custom inline cache implementation #220

Job	Run time
prepare	1s
test / prepare	2m 0s
test / run (containerd, ./frontend/dockerfile, integration)	3m 14s
test / run (containerd, ./frontend/dockerfile, dockerfile)	4m 7s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	3m 38s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	4m 11s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	3m 21s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	3m 54s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 18s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	4m 1s
test / run (oci, ./frontend/dockerfile, integration)	3m 45s
test / run (oci, ./frontend/dockerfile, dockerfile)	4m 30s
test / run (oci-rootless, ./frontend/dockerfile, integration)	3m 43s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	4m 5s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	3m 39s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	4m 4s
image	0s
release	0s
	56m 31s

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