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Skopeo is a tool for managing remote containers.
It has a list-tags subcommand which does exactly what it sounds like:
$ skopeo list-tags docker://docker.io/archlinux
Conventional container registries use the docker protocol, and this needs to be specified in the URL.
Note containers may have a ton of tags, so you might want to pipe the output to less or do some filtering. Some decent tips can be found in this blog post.

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