Pre-provisioned environments require certain override files to work properly. Then, those override files must also have a secret secret that includes all of the overrides you wish to provide in one file. For example, if you wish to provide an override with Docker credentials and a different source for EPEL on a CentOS7 machine, you can create a file like this:

- host: ""
  username: "my-user"
  password: "my-password"
  auth: ""
  identityToken: ""