charm does not support deleting images from a registry

[Jamon Camisso]

Attempting to delete an image from a registry configured with the charm results in an error:

curl -u "user:pass" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" -X DELETE https://<registryurl>:5000/v2/busybox/manifests/<sha256 hash>

{"errors":[{"code":"UNSUPPORTED","message":"The operation is unsupported."}]}

It looks like config.yml just needs storage to include a delete option, e.g.:

storage:
  delete:
    enabled: true
  swift: {.....}
  redirect: {.....}

[Tom Haddon (mthaddon)]

I think the charm should support this via an action, fwiw. Since the usage of this feature would most likely be for security reasons (because a particular image is known to be bad), it would be good to get this relatively soon.

[Kevin W Monroe (kwmonroe)]

This is up for review at:
https://github.com/CanonicalLtd/docker-registry-charm/pull/31

And available to test from the beta channel with:
cs:~containers/docker-registry-125

[Kevin W Monroe (kwmonroe)]

Released to stable at revision 136:

https://jujucharms.com/u/containers/docker-registry/

Note, we implemented both options to delete images as discussed in this bug:
1 - juju run-action --wait docker-registry/0 rmi image="ubuntu:18.04"
2 - juju config docker-registry storage-delete=true