Document RDS connections on EKS from the same VPC and via VPC peering

[abelanger5]

Location

• [ ] Browser
• [ ] CLI
• [ ] API
• [X] Documentation

Motivation

Connecting to AWS RDS is complicated without a step-by-step guide unique to Porter.

Requirements

• Document how to set up the RDS instance if it doesn't exist.
• Document how to connect to the RDS instance from the same VPC.
• Document how to configure VPC peering if an RDS instance already exists in a different VPC.