[FEATURE] Automating shellcheck

[elreydetoda]

Is your feature request related to a problem? Please describe.

Not really, but mainly just to ensure quality of shell script submitted.

Describe the solution you'd like

Using github workflow to use the shellcheck command ensuring all submitted shell scripts are up to standard.

Describe alternatives you've considered

I mainly want to keep this as much of a github only project as possible, so it all information about the project is visible to new people without having to leave the repo. Alternative are using the following of course.

• circleci
• travisci

Additional context