use crateget_env_var;
/**
* This function retrieves the JWT timeout from the environment variable.
* It returns the timeout as a `usize` if the environment variable is set and valid.
* If the environment variable is not set or is invalid, it returns an error.
* # Returns
* * `Result<usize, String>` - A result that contains the JWT timeout if successful,
* or an error message if the environment variable is not set or invalid.
*/