fix: get site_url to work with bedrock and multisite

src/Configuration/WordPressConfiguration.php

@@ -79,7 +79,7 @@ public function modify(Container $container)
 
             return new \WP_Site_Icon();
         });
-        $container['site_url'] = defined('WP_HOME') ? WP_HOME : '';
+        $container['site_url'] = set_url_scheme(get_home_url(), 'https');
         $container['uploads_basedir'] = $container->service(function () {
             return wp_upload_dir()['basedir'] ?? '';
         });