build: add CI task to justfile

[haraldmaida]

add a CI-like task to the justfile, for checking more things on a developer machine.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.85%. Comparing base (a914f5c) to head (24c90d6).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #82   +/-   ##
=======================================
  Coverage   92.85%   92.85%           
=======================================
  Files          41       41           
  Lines        5756     5756           
  Branches     5756     5756           
=======================================
  Hits         5345     5345           
  Misses        345      345           
  Partials       66       66           

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