cortex cluster up, an environment with the same name as your cluster is automatically created to point to your cluster and is configured to be the default environment. You can name the environment something else via the --configure-env flag, e.g. cortex cluster up --configure-env prod. You can also use the --configure-env flag with cortex cluster info to create / update the specified environment.cortex env list, change the default environment with cortex env default, rename an environment with cortex env rename, delete an environment with cortex env delete, and create/update an environment with cortex env configure.--configure-env on cortex cluster upcortex CLI to connect to an existing clustercortex CLI on a new machine, you can configure it to access an existing Cortex cluster.