Easy deploy to Cloud/Production Epic

We should make it easy to deploy LoopBack4 applications to most common production types:

• IBM Cloud & API Connect
• Twelve-factor platforms (e.g. Heroku), where configuration is read from environment variables (e.g. PORT, database connection strings, etc.)
• Docker and Kubernetes
• http://istio.io/
• Enable LB apps to be Cloud Native

Re-posting from https://github.com/strongloop/loopback-next/issues/1054:

• How do I modify behavior of my LoopBack4 application in production, e.g. modify error responses to not leak any sensitive data?
• How do I configure database connection strings, access credentials, port number to listen on, etc. for my LoopBack4 application?
• How can I secure my application? (This overlaps with the existing epic of Authentication/authorization/security.)
• How do I monitor behavior of my LoopBack application in production, what useful insights can I get on top of usual low-level Node.js metrics?
• How can I upgrade my applications with zero downtime? Is there anything special needed to enable blue/green deployments?
• Where can I find logs from my app? How can I produce my own log entries from my custom code (e.g. controller methods)?

Start by reviewing the production deployment goals listed in this issue and the linked prior issue. Break the epic into a concrete deployment target or question, such as environment-based configuration, Docker/Kubernetes, logging, monitoring, or zero-downtime upgrades. Done should be a separately scoped change with a clear implementation and verification path.