v0.21.0

Adding auto-release & updating docker Github workflows @danjbh (#57)

what?

I'm updating the Github workflows to bring it up to date -- this change includes support for auto-release and proper Docker image tagging when pushing to Docker Hub.

Add scaffolding @osterman (#56)

what

• add the initial scaffolding for the reference architecture

why

• show how to use cloud posse modules

Use README.yaml @osterman (#55)

what

• refactor into README.yaml

why

• maintainability
• closes #55

Introduce Simplified Reference Architecture @osterman (#54)

what

• Introduce an entirely new reference architecture
• Deprecate the previous architecture

why

• We've stopped practicing one repo-per AWS account because it makes GitOps incredibly difficult
• It's frequently better to have one repo per team, or business unit, or product, etc. Then all environments contained there in.
• We've moved from kops to EKS

references

• https://www.terraform.io/docs/cloud/workspaces/configurations.html#code-organization-and-repository-structure
• closes #46, #48, #51, #54