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hub.docker.com
In short: Docker Hub (hub.docker.com) accepts repo/profile link. It is free to submit, takes only a few minutes, and scores 48/100 on our impact ranking (long tail).
Publish open-source helper image only if useful.
Only if real image exists; avoid empty backlink repo.
Priority is later, which sets the band. It is free and quick to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.