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Complete removal of multiple deprecated images

DO NOT START WORK ON THIS ISSUE UNTIL 28/01/2026

Following the deprecation of the python-slim-bookworm, ucam-mellon-proxy, ucam-shib-proxy, and ucam-shib3-proxy images on 29/10/2025, the associated tags/repositories in the container registry should be removed on 28/01/2026.

Removing these tags/repositories will allow the online garbage collector to schedule the underlying layers and manifests for deletion within 24 hours. We should also update the DEPRECATED_IMAGES.md file to reflect that these images have transitioned from deprecated to removed. Finally, a post should be made in the UIS DevOps General channel to confirm their permanent removal from the registry.

Acceptance criteria

  • All tags/repositories for the python-slim-bookworm, ucam-mellon-proxy, ucam-shib-proxy, and ucam-shib3-proxy images are removed.
  • DEPRECATED_IMAGES.md is updated to reflect that these images are now in removed status.
  • A notification is posted in the UIS DevOps General channel.