Update docker-compose version to 3 to avoid mysql health check for starting api server

[wildmouse]

Refs: https://docs.docker.com/compose/startup-order/

The problem of waiting for a database (for example) to be ready is really just a subset of a much larger problem of distributed systems. In production, your database could become unavailable or move hosts at any time. Your application needs to be resilient to these types of failures.