Chiel dat 3282 set up ci

[cfernhout]

Basic setup for automatically testing unit tests on two versions of Python (3.7 & 3.10). Interestingly, some unit tests fail for Python 3.7.

[linear]

DAT-3282 Set up CI

Why and what

Supporting material (links, screenshots, documents, logs, stacktraces)

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[sirupsen]

@cfernhout sorry I was super unclear on Slack. Code here LGTM, I think my question for whether we should do more checks is basically: How much longer do I have to wait? How much more flaky is it likely to be?

I would love CI to pass in 2min for everything. If it takes much longer, I think we can peel some of these versions/OS combinations off, at your discretion

[cfernhout]

@sirupsen For now having a matrix of 4 iterations will run almost always in parallel. Only if the number of jobs explode (approx > 10) then you will get to the point that there is a chance that you need to wait on machines to become available. For now, everything runs quickly.

[sirupsen]

awesome, LGTM

@erezsh CI is failing because the Literal type wasn't introduced until Python 3.8. Can we replace it with something else, or do you think we should bump the minimum version?