packit versioning schema: include PR ID

@pirat89 told me yesterday that we should pimp our versioning model even further by including PR ID in it: https://github.com/oamg/leapp-guidelines/blob/master/build-schema.md

<name>-<version>-0.<timestamp>.<short-hash>.<branch>.PR<number>

With such a change, if the project builds everything in a single copr repo, you can then install a specific PR easily:

$ dnf install packit\*PR123\*

neat! 🍺

The way to implement this is probably let the run_copr_build API method accept a suffix for RPM release and then pass it from p-s. Easy-peasy.

[dgkncelik]

@TomasTomecek i install environment on local and im reading the source code to understand the arhitcture. Could you give couple more days?

[TomasTomecek]

Do you have the current versioning schema documented somewhere? Our QEs are creating regexps based on that, and I believe they’d love to track changes to the schema. CCing @AloisMahdal.

We don’t have it documented, here’s the code: https://github.com/packit-service/packit/blob/master/packit/upstream.py#L409

Definitely worth documenting though.