Get metadata from Codeberg for asset generation

[Selene-Amanita]

Following #648, the algorithm checks for Github and Gitlab but not Codeberg.

At the moment that I'm writing this, only one asset would benefit from this and its case could be handled by having an explicit version+license in the asset toml (when that change is made), so not a priority, putting that here for the future

[mockersf]

or note as a limitation: "if you want automatic metadata, uses either a crates.io link, or GitHub / gitlab repo"