Add REUSE support in the GitHub licensee library

[ottok]

Currently it seems that the GitHub licensee Ruby library they use for detecting licenses does not read the path LICENSES/. People hosting their code on GitHub probably value having GitHub detect their license correctly. Thus it might help drive adoption if the licensee matchers at https://github.com/licensee/licensee/tree/main/lib/licensee/matchers were extended to read the places REUSE recommends developers to use.

I am posting this for visibility while I am fully aware that this is not a bug in the reuse-tool itself.

[Mikaela]

licensee/licensee#635 looks like a related issue on their side although it's only about SPDX identifiers rather than the LICENSES/ directory.

[mxmehl]

There have been a number of upstream issues about this already, and also discussions via Twitter IIRC. Mike Linksvayer has made it quite clear that they only implement this when a pull request is made by a third party.

The REUSE team doesn't currently plan to do that but we welcome any initiative!

[sdavids]

Mike Linksvayer has made it quite clear that they only implement this when a pull request is made by a third party.

The PR should target which repo?

https://github.com/licensee/licensee ?

[nicorikken]

Indeed, unless GitHub has changes libraries in the mean time, but I wouldn't think so. Regardless, it would be good to have it in this commonly used library.

[carmenbianca]

Linking the relevant licensee issue here: licensee/licensee#490