sketching out a community & patch-based approach for adding extra features

[xynydev]

I think it would be beneficial to have some kind of official and documented way of adding "extensions" or "patches" to startingpoint-based images / repos.

Having the scripts functionality, it would be entirely possible to boostrap that for such a feature. The scripts already have access to the recipe (where they could read their configuration, maybe from under a separate namespace like unofficial:).
It would be pretty easy to have a system where; Oh you want libvirt and virt-manager? Well this guy maintains a set of packages for that that you can just pull in like this.

The question is, what is the mechanism for pulling it in. There could be an extra option, like extrarepos: that just downloads scripts for you, or the scripts could just be added manually.

[xynydev]

We have ublue-os/bling now, where extra "bling" should be added and maintained, then pulled in here. Possible community endeavours would probably go via a similar route, COPYing stuff between containerfiles, RPMs, and so forth. Scripts can easily add new sections to recipe.yml, and scripts can be easily COPYed around.