Investigate renaming package to apt-transport-ar

[hopkiw]

The naming scheme for packages is recommended in sources.list(5):

  adding more recognizable URI types

        APT can be extended with more methods shipped in other optional
        packages, which should follow the naming scheme apt-transport-method.

This would imply naming the package apt-transport-ar.

[ericsampson]

I'd suggest apt-transport-gar, as "artifact registry" is a pretty generic name without the qualifier.
And the gar acronym is already being used here.