Retention/expiration policy for container images
## Description Pushing images from CI is great, but after a while, those images are going to take up a lot of space and never be referenced again. We need a project level retention policy for automatically pushed images. e.g. "store not more than 30 images for master branch and delete after 2 weeks". We also need reasonable defaults so GitLab.com and self-managed instances behave nicely. * Keep tagged images longer? Differentiate SHA-type tags and branch tags from release-type tags, like `latest` or `v5.4`? * Keep 3-5 recent ones longer? * Also expire after time * Differentiate default policy on subscriptions? ## Proposal ## Links / references * From: https://about.gitlab.com/2016/05/23/gitlab-container-registry/#comment-2801155105
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