RSS feed for all package releases

Some users want RSS feeds like CentOS: https://feeds.centos.org/

I'm thinking of this feed is separate from errata and just notify all package releases not only security fixes.

It would be separated into per arch/repository.

### Requirements

A feed entry should include:

* Package name
* Package version
* Package release date
* Architecture
* Repository
* AlmaLinux version
* Changelog picked up from SPEC file (optional)