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Docker registry cleanup

For every repository:

  1. Images updated less than 1 day ago are kept

  2. Images updated more than 1 year ago are deleted

  3. Images with org.opencontainers.image.version label matching existing tags/branches or open pull requests are kept

  4. Everything else is deleted

REST API pagination race condition

It seems that GitHub API pagination can "skip" a branch/tag/pull request if another branch/tag/PR is deleted concurrently.

However, we mostly care about tags. Images for branches and pull requests are not as precious and can be rebuilt if necessary.

Tags should never be deleted - so this isn't a real issue.