[github-workflow] run linter over bash scripts for PRs over main branch

[najeal]

Closes #370

[patrick-ogrady]

Shellcheck is already installed: https://github.com/actions/runner-images/blob/af0df299674bc781d6a4f891d9cea62b438e1332/images/ubuntu/Ubuntu2204-Readme.md?plain=1#L367

You should just need to do something like this: https://www.shellcheck.net/wiki/GitHub-Actions

[najeal]

I did not see it as I use act to run the workflow locally I had error without installing it.
Change done 👍

[patrick-ogrady]

I moved some stuff around and updated the linter strictness. Once you fix the linting errors, will merge!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.43%. Comparing base (ae50e2d) to head (fda7d94).
Report is 1 commits behind head on main.

@@           Coverage Diff           @@
##             main     #373   +/-   ##
=======================================
  Coverage   94.42%   94.43%           
=======================================
  Files          93       93           
  Lines       25128    25128           
=======================================
+ Hits        23728    23730    +2     
+ Misses       1400     1398    -2     

see 2 files with indirect coverage changes

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[patrick-ogrady]

Thanks!