Support OWNERS files

[carolynvs]

Is your feature request related to a problem? Please describe.
I want to specify exactly who can provide reviews and approve pull requests since there are a lot of people in the organization who do not qualify as reviewers and approvers.

Describe the solution you'd like
I'd be happy with any way to specify a named set of people or teams that can be reviewers and approvers. Either by reading the OWNERS file (like prow does), or something more simple like just passing the action a list of names in the workflow file. I realize the full logic of owners files is pretty complex, and I just care about having a bit more control than just org membership.

Describe alternatives you've considered
N/A

Additional context
I'm happy to submit a PR for this if this is a welcome feature.

[jpmcb]

Thanks for opening this feature request! I think this is a great idea.

Either by reading the OWNERS file (like prow does)

I think that's the way to go on this but we could also do something simple in the action yaml file too.

I'm happy to accept a PR on this! 🚀

[carolynvs]

Excellent, I'll work on it this weekend.