Imports of package imagerefchecker

PathSynopsis
github.com/docker/docker/image
github.com/docker/docker/layerPackage layer is package for managing read-only and read-write mounts on the union file system driver.
github.com/moby/buildkit/cache
github.com/opencontainers/go-digestPackage digest provides a generalized type to opaquely represent message digests and their operations within the registry.
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.