Nope! we’re using
https://circleci.com/gh/{GH-USER}/{repo-name}/edit#env-vars for secret variable holding
as referred to here https://support.circleci.com/hc/en-us/articles/360006717953-Storing-secret-files-certs-etc-
https://circleci.com/docs/2.0/env-vars/#setting-an-environment-variable-in-a-project