Add build step to ci

[krl]

fixes #415

[Acaccia]

(unrelated, but could be fixed with this PR) I don't know much about CI, but shouldn't there be in the on section the path for the CI files, to make sure it runs when the files change?

UPDATE: seems doable: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#example-including-and-excluding-paths

[csgui]

I don't know much about CI, but shouldn't there be in the on section the path for the CI files, to make sure it runs when the files change?

Yep, that would be good to have.

Or maybe we can only remove the **.yml from the paths-ignore.

[codecov[bot]]

Codecov Report

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

Project coverage is 86.51%. Comparing base (ab1c5e5) to head (d1e59e8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #417 +/- ## ========================================== - Coverage 86.52% 86.51% -0.02% ========================================== Files 43 43 Lines 19167 19167 Branches 19167 19167 ========================================== - Hits 16584 16582 -2 - Misses 1118 1120 +2 Partials 1465 1465 ```

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