FEATURE: Ability to maintain Deployment Environments

[actuarysailor]

Is your feature request related to a problem? Please describe.
Ability to configure, update, or remove deployment environments and the associated protection policies, reviewers, secrets, and variables therein.

Describe the solution you'd like
Expand scope of code and settings YAML file

Describe alternatives you've considered
Use of other tools / actions; but better to just have one action that does everything