Clojurians Log v2

Thank you @joshmiller for the update of your krell template. I have been trying to use with relative success. I have a question, I have been trying to add re-frame as a dependency in the deps.edn file at root.

{:deps {io.vouch/krell    :mvn/version "".5.3""
        reagent/reagent   {:mvn/version "1.1.1"
                            :exclusions [cljsjs/react cljsjs/react-dom]}
        re-frame/re-frame {:mvn/version "1.3.0"}
        }}

How do I use environment variables to configure my build? I am using Krell.