ci: try a simple ci.yaml (experiment)

[jandom]

When setting up to work on this repo, I found the setup very challenging. There is no setup script, so I worked based on what the ci.yaml does – and that contained a number of curveballs. Luckily things can be simplified and everything still works!

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (9ecbdea) 69.26% compared to head (333beba) 69.26%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #272 +/- ## ======================================= Coverage 69.26% 69.26% ======================================= Files 22 22 Lines 3966 3966 Branches 717 717 ======================================= Hits 2747 2747 Misses 1038 1038 Partials 181 181 ```

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[jandom]

@orbeckst this one puts a smile on my face and makes things a bit simpler, please have a look

[orbeckst]

thanks!

[jandom]

Thank you for the feedback 🎉