add only_changed input to run rubocop only against changed files #103
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Add an input to limit running rubocop only against files changed in the PR.
Had to switch to bash for process substitution and working with arrays.
Ignore if there are more than 100 changed files. Main reason is to protect from possibly hitting the command line length limit. In reality the command line length limit most probably (depends on OS) allows much higher number of files and if needed can be calculated or provided as one more input.
Fix ci workflow to fetch all commits for pr branch plus head commit of base branch to be able to find changed files.
Will conflict with #102, I will update whichever is not merged first