fix: import of translations for cronjobs was missing (#321)

refactor: retrieval of webroot path
chore: add sqlite to docker image

endpoints/cronjobs/updateexchange.php

@@ -1,6 +1,5 @@
 <?php
-    require_once 'conf.php';
-    require_once $webPath . 'includes/connect_endpoint_crontabs.php';
+    require_once __DIR__ . '/../../includes/connect_endpoint_crontabs.php';
 
     $query = "SELECT api_key FROM fixer";
     $result = $db->query($query);