[FYRA-263] Terra on other platforms

There has been an internal and external interest for bringing Terra to other platforms such as OpenSUSE and EL.

Items for consideration:
- How would sources be versioned for other distros? Would we have an EL9 branch, like how we currently have a f38 branch?
- Should sources be separate in the first place? It's possible to have a spec file that builds for multiple platforms, see this [prismlauncher spec commit](https://github.com/terrapkg/packages/blob/e8ec7f262062b12cf0826ffd8d08dc2546b737a8/anda/games/prismlauncher/prismlauncher.spec
).
- Branding for these new repos? Policy updates?

_{[FYRA-263](https://linear.app/fyra/issue/FYRA-263/terra-on-other-platforms)}

Start by comparing the current f38 branch with the referenced anda/games/prismlauncher/prismlauncher.spec commit. Use that comparison to decide how sources should be versioned or shared for OpenSUSE and EL, and identify the branding and policy updates that define completion.

Written by the indexing model from the issue text.