Container Registry: multi-arch container images not grouped under a single label

[ehuelsmann]

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When uploading multi-arch Docker containers built with docker buildx build --platforms linux/arm64,linux/arm/v7,linux/amd64, results in a tag on the manifest, but not on the images referred to by the manifest. On Docker Hub, the manifest and the containers are all grouped under the tag. Deleting the tag on Docker Hub results in the deletion of the manifest and the referenced images. It would make the container registry much more usable if it behaved like the Docker Hub container registry and use the same grouping and delety-by-group behaviours.

[github-actions[bot]]

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