Abandoned packages detection for Container Images

[phhutter]

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I would like to use the configuration option abandonmentThreshold not only for github-releases or gitlab-releases, but also for container images.

It’s not entirely clear to me whether this should already work or not, but in my test the image was not flagged as abandoned. If it’s not yet supported, could we add support for container images as well?

It could be cased on the lastModified date reported by the registry:

DEBUG: http cache: saving https://myrepo/image/manifests/v0.1 (etag=xx, lastModified=Tue, 20 Dec 2022 01:13:54 GMT) (repository=xx)