SiteWeaver_CMS/config/bootstrap.php

<?php
declare(strict_types=1);

require __DIR__ . '/../vendor/autoload.php';

$dotenv = Dotenv\Dotenv::createImmutable(__DIR__ . '/..');
$dotenv->safeLoad();

$mergedEnv = $_ENV + $_SERVER;

use League\Container\Container;
use SiteWeaver\Core\Config;
use SiteWeaver\Core\Router;
$container = new Container();

// Register core services
$router = new Router();
$container->add('router', $router);
$container->add('config', function () use ($mergedEnv) {
    return new Config($mergedEnv);
});

return $container;