Add a linting check in CI pipeline

[david-mears-2]

NB this does not work, does not shout if things are malformed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.07%. Comparing base (b368f37) to head (7c7c18f).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   93.84%   94.07%   +0.22%     
==========================================
  Files           9        9              
  Lines         130      135       +5     
  Branches       39       41       +2     
==========================================
+ Hits          122      127       +5     
  Misses          8        8              

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