Service health checks

[zmitchell]

process-compose has support for various types of health checks: https://f1bonacc1.github.io/process-compose/health/

There are essentially two types of checks:

• liveness (for daemons only)
  • Run a command
• readiness
  • Run a command
  • Send a GET request

It's unclear if there's a way to surface health information directly, or if it is only used to inform the process state (running, completed, etc).

I'm not sure if we want to expose this the way that process-compose does (by treating daemons and other processes differently), or come up with our own way to present the options and the serialize to the process-compose representation.