silverstripe-sqlite3/_configure_database.php

<?php

// Script called from ConfigureFromEnv.php
global $databaseConfig;
if (strpos($databaseConfig['type'], 'SQLite') === 0) {
    if (defined('SS_SQLITE_DATABASE_PATH')) {
        $databaseConfig['path'] = SS_SQLITE_DATABASE_PATH;
    }

    if (defined('SS_SQLITE_DATABASE_KEY')) {
        $databaseConfig['key'] = SS_SQLITE_DATABASE_KEY;
    }
}