{
  "development": {
    "username": "scott",
    "password": "password",
    "database": "workouts",
    "host": "127.0.0.1",
    "dialect": "postgres"
  },
  "test": {
    "username": "scott",
    "password": "password",
    "database": "test_workouts",
    "host": "127.0.0.1",
    "dialect": "postgres"
  },
  "production": {
    "username": "root",
    "password": null,
    "database": "database_production",
    "host": "127.0.0.1",
    "dialect": "postgres"
  },
  "ci": {
    "username": "ubuntu",
    "password": null,
    "database": "circle_test",
    "host": "127.0.0.1",
    "dialect": "postgres"
  }
}

{
  "development": {
    "username": "scott",
    "password": "password",
    "database": "workouts",
    "host": "127.0.0.1",
    "dialect": "postgres"
  },
  "test": {
    "username": "scott",
    "password": "password",
    "database": "test_workouts",
    "host": "127.0.0.1",
    "dialect": "postgres"
  },
  "production": {
    "use_env_variable": "DB_CONNECTION_URL"
  },
  "ci": {
    "username": "ubuntu",
    "password": null,
    "database": "circle_test",
    "host": "127.0.0.1",
    "dialect": "postgres"
  }
}

Update the DB connection to use the env
Update the DB connection to use the env
