list env vars for project

[frankiebee]

          In the interests of avoiding naming conflicts, please remember DevOps/SRE/SecOps teams have already been using [this single point of truth to list environment variables](https://github.com/entropyxyz/meta/wiki/Environment-variables#shell-environment-variables) for our other projects and consider consulting and contributing back to this list when you are deciding on environment variable names for your own projects. Thank you.

Originally posted by @vitropy in #146 (comment)