Create UI for cleaning up unused images in the registry
As Domino is used, environments create images in the registry. When environments are archived these images are not cleaned up and so the registry continues to grow.
It would be good to have a UI in the admin screens to clean up the registry, removing an images that are no longer used. Also, the UI should be able to show all the layers stored in the registry and which environments they're used by.
Obviously, this has the ability to break reproducibility in Domino so the default should be to archive unused layers to S3 rather than permanently deleting them, but permanent deletion could be an option as well. It should then be possible to restore needed layers if the environment using archived layers is later unarchived itself.