Database driver is not a environment specific config

Unless I’m missing something it’s not really practicable to use 'mysql' in one environment and 'pgsql' in another.

Line 12 in f5c0828

'driver' => getenv('DB_DRIVER'),

The installer’s ability to define database connection settings (including the driver) only works if config/db.php is getting all its values from environment variables defined in .env (using the same variable names that this project uses).

Once connection settings are established, you’re correct that there’s not much value in defining the DB driver in .env versus just hard-coding it in config/db.php.