[LawnGnome]

The standard supports a repository_url "qualifier" (query parameter)[0], which can be used to override whatever the default registry is (which, for Docker, is hub.docker.com[1]).

[0]: https://github.com/package-url/purl-spec/blob/main/PURL-SPEC...

[1]: https://github.com/package-url/purl-spec/blob/main/PURL-TYPE...