Allow to provide Git config or disable it

[jcrqr]

Description

This action setups Git automatically for the user which is nice in most use-cases but decreases customisation in certain workflows.

For example, one might want to use a custom GitHub App's as the commiter, so he/her can add extra validations around it and more easily audit what workflows are doing what across multiple repositories.

Possible Solutions

• Allow the user to pass git_name and git_email inputs or default to GitHub Action's ones
  or
• Allow the user to pass a setup_git flag to toggle this feature and setup git before running the action

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If this sounds a reasonable feature for you, I can create a PR adding it.

Thanks in advance!

[woile]

Sounds good! I like it, feel free to create a PR