Add CI to enforce some coding conventions and sanity checks

[roata]

Most likely it could be a mixture of pylint and black, to ensure that whoever sends pull requests will pass the minimum sanity checks, before an actual human has to look their code.

This will also help contributors help themselves

[roata]

The merge request that adds checks to the code was approved. The next step is to use a CI mechanism to automatically reject requests that don't meet the criteria, so contributors can get quick feedback and improve their work.

[PlugaruT]

I think we already have that :heavy_check_mark:

[roata]

Indeed.