Support Go coverage natively

[shyim]

Hey,

This action requires cobertura, it would be nice if we could pipe directly the Go native Coverage Profile into this Action to simplify the setup process.

Right now I have to use a second program to convert the result into a cobertura format: https://github.com/boumenot/gocover-cobertura, which I would like to avoid for simplicity reasons and less dependency

I can make an PR, if it's fine

[joshhale]

Thanks for the feedback @shyim ! ❤️

Indeed at this point we only support the Cobertura format. We would like to expand on this to support more coverage formats and languages.

I anticipate however, that we'll do this on the internal side after upload, so I'm hesitant to add conversion logic into the upload action itself particularly as existing format converters aren't always reliable. -Not that we're ruling it out.

For now, please convert coverage files before passing to the action, and keep the feedback coming! 🙏