Add Ruff linter action

[mih]

Easy to turn off when it becomes too annoying. But it is only simple to introduce right now.

Closes #2

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Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 40.00%. Comparing base (ba02869) to head (f8f57a5).
Report is 2 commits behind head on main.

❗ Current head f8f57a5 differs from pull request most recent head d61694f. Consider uploading reports for the commit d61694f to get more accurate results

Files	Patch %	Lines
datasalad/dummy.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #6       +/-   ##
===========================================
- Coverage   50.00%   40.00%   -10.00%     
===========================================
  Files           2        2               
  Lines           4        5        +1     
===========================================
  Hits            2        2               
- Misses          2        3        +1     

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[mslw]

I wanted to add a post-hoc comment that I like the idea. I've heard of ruff before and it may be interesting to see how it works in practice.

It wasn't clear to me at the beginning, but it became clear with a very quick search, that:

• the ruff action is a pass/fail test
• ruff's formatting defaults are black-compatible, meaning e.g. 88 character line width (which I like over the traditional 80)