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• If possible, I've reproduced the issue using the 'main' branch of this project

Steps to reproduce

container image prune command claims to remove "unreferenced and dangling images" but actually only removes orphaned blobs from the content store. No complete images are ever deleted, even when there are many unused images consuming disk space. This is because the underlying ImageStore.prune() method doesn't support filtering by container references (see apple/containerization#417).

We should add support for removing unreferenced images, and add -a/--all flag to remove all unreferenced images (not just dangling ones).

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