add pagination for artifacts retrieval

[fabiogallotti]

Hello @ewjoachim,

following the discussion we had some weeks ago with @AlessandroMiola here, I'm proposing you a small fix in order to handle the pagination for artifacts.

I'm looping page by page and, if the result of page n+1 is empty, I'm breaking out of the loop. The rationale behind is that If we ask a page without artifact we get an empty response (see for example https://api.github.com/repos/pydantic/pydantic/actions/runs/9815232181/artifacts?page=3)

To be honest, I'm not very happy with this solution, probably the best one would be to migrate from the https://github.com/michaelliao/githubpy client (that I noticed it's not maintained anymore) to something like https://github.com/PyGithub/PyGithub, but the changes would be substantial I guess.

I also took the occasion to introduce a Makefile to ease local development, let me know what you think about it ;)

Closes #438

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