RFC - Remove required packages

[underscorgan]

I'm not entirely clear on the history behind this feature, and this
feels sort of hack-y. If you could explain why this is needed that would
be awesome, or if it isn't just merge this :)

[daenney]

Ah. I know this. The idea here was that for some repositories you need a package installed that provides the keys for the repo. In the case of the main Debian repositories, the debian(-archive)-keyring packages.

However, if you manage to install a Debian system without those packages you deserve what's coming to you, a world of pain. As far as I'm aware only the main Debian repositories use this format and that's mainly because there's so many keys in there that distributing them without a package would be painful. Every 'normal' repository you add will generally just have a single key.

I think the other place this was meant to be used is to that you could install the tooling needed for apt:ppa to be used without getting into the chicken-egg issue of Apt::Source <||> -> Package <||>.