Hello. I'm creating a testing stack for a group of 10 dynamically generated IAM users. I started out from this example: https://github.com/outerbounds/metaflow-tools/tree/master/aws/terraform/metaflow. What is the cleanest way to add those IAM users permission to run everything configured by Metaflow? I know there is probably an easy way but currently I don't see any other than adding permission to assume the metaflow_user_role to all users one by one. Is there a cleaner way?