Custom value setter

In this example, a custom function is used to set a value in the configurations struct.

The configuration struct has a field of type roles, which has a method SetValue defined on it. After fetching configuration values from environment variables, this method is executed.

The ROLES environment variable will have the value admin owner member as a single string, but the field requires it as an array of strings. The SetValue method will split the string and add each value into the roles field.