custom git user input option

[jackleslie]

Context

Fixes #126, alternative solution to #127

Instead of implementing git commit signing into the action, we could allow an input option to disable the setupUser function so that consumers can use their own git user to create commits in this action.

Changes

• Add setupGitUser boolean input option
  • Updated @actions/core to be able to use getBooleanInput
  • Default to true
• Don't run gitUtils.setupUser() if setupGitUser is false
• Update docs

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Latest commit: f4b970b

The changes in this PR will be included in the next version bump.

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[jackleslie]

@Andarist @mitchellhamilton just bumping this if that's okay

Would you prefer this approach or the one in #127?

[Andarist]

@jacklesliewise the only concern I have with this PR is the nit about the name that has been chosen for the option. I think this might be useful to some people in other situations than the one covered by #127 so this should land either way (regardless of what we decide for the #127 but most likely we'll close it, for the time being, we can always revisit this in the future).

[jackleslie]

Thanks @Andarist, I've closed #127 for now and updated this PR as per your comment