feat: add a setup action

[justinmchase]

Proposed changes

This will make this repo into a github action as well.

- uses: optum/semver-cli/setup
  with:
    version: 0.8.11 # optional

Types of changes

What types of changes does your code introduce? Put an x in the boxes that
apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)

Checklist

• I have read the
  CONTRIBUTING
  doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Further comments

I have tested it from an external repo and it seems to work fine.

[robertcrockett]

Thanks Justin!