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I believe that if you need to read configuration from the environment, it would be best to make it explicit by doing it in your config.php file directly. You would know your setup and would know what you're explicitly expecting to be in the environment. If you make something magic, it adds an additional layer of confusion when trying to debug. Essentially, I'm recommending just pulling from $_ENV directly in config.php in the locations where you want to use it (perhaps throwing an error if expected elements aren't there). You could even use your demo code in config.php if you do want to keep the magic.

The vast majority of our customers are likely in a setup where they don't actually even control the environment variables. If you are and prefer to pull stuff like this from the environment, I think just setting it up for your needs directly (and IMO, explicitly) is the best approach.