Promote to model environment

curl --request POST \
--url https://api.baseten.co/v1/models/{model_id}/environments/{env_name}/promote \
--header "Authorization: Bearer $BASETEN_API_KEY" \
--data '{
  "scale_down_previous_deployment": true,
  "deployment_id": null,
  "preserve_env_instance_type": true
}'

{
  "id": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "name": "<string>",
  "model_id": "<string>",
  "is_production": true,
  "is_development": true,
  "active_replica_count": 123,
  "autoscaling_settings": {
    "min_replica": 123,
    "max_replica": 123,
    "autoscaling_window": 123,
    "scale_down_delay": 123,
    "concurrency_target": 123,
    "target_utilization_percentage": 123,
    "target_in_flight_tokens": 123,
    "max_scale_down_rate": 123
  },
  "instance_type_name": "<string>",
  "environment": "<string>",
  "labels": {}
}