I need an implementation (and interface) that can take as input:

• an imageRef
• the location of the registry cache storage (eventually)
  and output
• the digests for all layers of that image
• the digests for all manifests of that image

example:
for image localhost:5000/ubi8/ubi:latest (value from the collected map), I can navigate to localstorage/docker/v2/repositories/ubi8/ubi and take all digests under

• localstorage/docker/v2/repositories/ubi8/ubi/_layers
• localstorage/docker/v2/repositories/ubi8/ubi/_manifests

The implementation can be something else. This is just an example.