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scrub: also create a media-type scrub method instead of just repo
Is your feature request related to a problem? Please describe.
As we add more media-types (now we also support manifest index which is a container of images), it needs to be scrubbed differently.
Describe the solution you'd like
foreach manifest in a repo: switch manifest.mediaType: case ImageManifest: // we already support this case ImageIndex: // unpack the manifest, iterate over each manifest and scrub them, this is NEW case ArtifactType: // something else, this is future
The image index case was covered in https://github.com/project-zot/zot/pull/1031. The artifact case is postponed for now.
Since the artifact manifest was removed, the only remaining requirement is to also take the image manifest 'Subject' into consideration when running scrub.