RFE: Pass exclude patterns to `git ls-files`

[zbeekman]

Describe the solution you'd like

Add the ability to pass exclude patterns to git ls-files to manipulate or restrict the scope of the linting.

Describe alternatives you've considered

• Maybe we could pass patterns to EditorConfig? Maybe we might want to do both?
• Alternatively a file, glob or regex could be passed to the action and used to prune out files or restrictively (whitelist) include them.