When calling `kamal app exec` for new non interactive containers, run the command per role on each server and include the role config including the environment. Fixes: https://github.com/basecamp/kamal/issues/492
When calling `kamal app exec` for new non interactive containers, run the command per role on each server and include the role config including the environment. Fixes: https://github.com/basecamp/kamal/issues/492