Fix autoload path

Author: marcreichel

mantis2github

@@ -12,7 +12,23 @@
 (new class() {
     public function main()
     {
-        require_once $_composer_autoload_path ?? __DIR__ . '/../vendor/autoload.php';
+        if (isset($GLOBALS['_composer_autoload_path'])) {
+            define('COMPOSER_INSTALL_PATH', $GLOBALS['_composer_autoload_path']);
+
+            unset($GLOBALS['_composer_autoload_path']);
+        } else {
+            foreach ([__DIR__ . '/../../autoload.php', __DIR__ . '/../vendor/autoload.php', __DIR__ . '/vendor/autoload.php'] as $file) {
+                if (file_exists($file)) {
+                    define('COMPOSER_INSTALL_PATH', $file);
+
+                    break;
+                }
+            }
+
+            unset($file);
+        }
+
+        require COMPOSER_INSTALL_PATH;
 
         $configValues = (new \Artemeon\M2G\Config\ConfigReader())->read();
         $githubConnector = new \Artemeon\M2G\Service\GithubConnector($configValues);