Officialize python version supported and OS systems

[dodu94]

Add automatic testing workflows for all OS and python versions

[JezSw]

Hey Davide, in case it's useful I have been looking at this a bit but wasn't sure what we'd want in the end. Take a look at the testing workflow at my fork @ https://github.com/JezSw/JADE/blob/CICD_testing/.github/workflows/pytest.yml.

[dodu94]

Hello Jez,
yes, the use of matrix was exactly what I had in mind. I implemented it already in another repo but there I distinguished in two different workflows the windows and linux testing in order to have two distinct badges for the test results (you can check https://github.com/Fusion4Energy/F4Enix for reference).

We can finalize this next week, as we also need to decide which python versions to support. I know that in the past there was a need for UKAEA to support back up to python 3.6 being that the python version installed in your cluster. It is a pretty old version though.

[JezSw]

@dodu94, can we close this issue with PR #224?

[JezSw]

PS I do need to document the modified testing command to account for the differently named coveragerc file though. Will do that later today

[dodu94]

indeed