Add environment variable support

[sviluppomania]

The JWT_AUTH_SECRET_KEY as well as JWT_AUTH_CORS_ENABLE can be read from environment variables instead of hardcoding in wp-config.php

[sun]

You can put the following lines into your wp-config.php to not hardcode them:

define('JWT_AUTH_SECRET_KEY', $_ENV['JWT_AUTH_SECRET_KEY'] ?? '');
define('JWT_AUTH_CORS_ENABLE', $_ENV['JWT_AUTH_CORS_ENABLE'] ?? '');

This has the benefit that you are explicitly documenting which constants are being read from environment variables in your setup.