Custom inline cache implementation #233

Job	Run time
prepare	1s
test / prepare	1m 38s
test / run (containerd, ./frontend/dockerfile, integration)	5m 13s
test / run (containerd, ./frontend/dockerfile, dockerfile)	4m 4s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	3m 45s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	3m 48s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	3m 30s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	3m 56s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	3m 24s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	3m 49s
test / run (oci, ./frontend/dockerfile, integration)	3m 21s
test / run (oci, ./frontend/dockerfile, dockerfile)	4m 0s
test / run (oci-rootless, ./frontend/dockerfile, integration)	3m 23s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	3m 36s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	3m 16s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	3m 53s
image	0s
release	0s
	54m 37s

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