Handle openvpn requiring sudo and add CI tests

[BeethovenKodar]

Closes #4.

[BeethovenKodar]

I added CI tests for both macOS and Ubuntu (the ones that used to run locally only before) and sudo stuff works cleanly now. Though I'm not sure how to run the lint check, it seems stuck.

[BeethovenKodar]

@bekelley @nkakouros Why is the lint not working just now? https://github.com/KTH-SSAS/python-openvpn-client/actions/runs/11109014995. Also any of you approve this so this is auto-merged when the checks pass.

[bekelley]

hmm, i can't figure out why the linter isn't working here.

I had thought maybe it was something changing in Action permissions/access token API, but I just tested from a branch on the twmn repo and it works there.

I'm not sure what has change locally to this repo..

[BeethovenKodar]

I'm thinking that this repo has to be added/configured in the settings page for twmn-ci. But I'm not very well-versed with these types of settings.

[BeethovenKodar]

@bekelley I'm pretty sure now after reading some documentation that it can't find lint.yml since this repo is public and twmn-ci is private and reusing the linting workflow here would disclose the details of the private lint.yml. I could copy the original workflow here for the time being, what do you think? Or, we could skip linting and ensure it's done locally instead, or possibly make the twmn-ci repo public although I don't think this is a great solution.

Also, this PR is ready for merging logic-wise.

[BeethovenKodar]

[BeethovenKodar]

@nkakouros @bekelley ?