ci: enable ShellCheck 🐑

[jamacku]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.56604% with 5 lines in your changes missing coverage. Please review.

Project coverage is 83.88%. Comparing base (cc6e734) to head (ef62d44).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/query.ts	0.00%	2 Missing ⚠️
itest/bugzilla-environment.ts	0.00%	1 Missing ⚠️
scripts/post-version.js	0.00%	1 Missing ⚠️
src/validators.ts	92.85%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #159   +/-   ##
=======================================
  Coverage   83.88%   83.88%           
=======================================
  Files           8        8           
  Lines         844      844           
  Branches      128      128           
=======================================
  Hits          708      708           
  Misses        134      134           
  Partials        2        2           

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