add Python and OS compatibility tests and Github action runners.

[ernstleierzopf]

Task

Fixes #54

Description

see #54 (comment)

How Has This Been Tested?

Github Actions running

Checklist

• This Pull-Request goes to the development branch.
• I have successfully run prek locally.
• I have added tests to cover my changes.
• I have linked the issue-id to the task-description.
• I have performed a self-review of my own code.

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[ernstleierzopf]

@thorinaboenke I added some compatibility tests for different python versions and OSes offered by Blacksmith.
Are you able to still merge the pull request, even though the experimental python 3.15 test fails? The actions are successful, even with the experimental test failing.

What do you think about these tests?

P.S. For now I comment this test, just because it might look bad for every PR to fail.