Template CloudFormation parameter configuration

[rmc3]

The parameter configuration for CloudFormation stack resources should be capable of being rendered via a templating engine and loaded as YAML. These parameters should be provided in a separate file, and should be referenced by relative path in the main organization configuration YAML object.

The main organization YAML object should also have a parameter that provides a path to the directory containing the parameter configuration templates. This may also need to be passable by the command line, etc. during runtime.

This might be implemented by something like Jinja2. The templating namespace should support both:

• Common queries via provided methods, e.g. "get me a list of the account IDs for all accounts created in this organization"
• Access directly to the Organization model for more niche queries as required by the user