use crateget_env_var;
/**
* This function retrieves the JWT secret from the environment variables.
* It looks for the "JWT_SECRET" variable and returns its value as a byte vector.
* If the variable is not set, it returns an error.
* # Returns
* * `Result<Vec<u8>, String>` - A result that contains the JWT secret as
* a byte vector if successful, or an error message if the variable is not set.
*/