Documentation for this topic is now available on our documentation site: https://circleci.com/docs/2.0/env-vars/
Thanks for that summary! I just started with CircleCI 2 using your documentation and sample applications. When configuring the environment variables for an image and the build steps, I notified a difference: The keyword in the circle.yml file for an image specific environment variable is “env”, where the required keyword in the build stage is “environment”. It would be great if I could use the same name for both (which doesn’t work right now).
I agree! Our support for env variables will continue improve, from both functional and UX perspectives.