Allow to append customn string to templated non-yaml files

src/Handler.php

@@ -229,6 +229,9 @@ class Handler extends BaseHandler {
           // Render the string again so that custom content can also use variables
           $rendered = $this->config->render($filename, $rendered);
         }
+        elseif ($extraOptions !== NULL) {
+          $rendered .= $extraOptions;
+        }
         if ($fs->exists($file)) {
           if (md5_file($file) === md5($rendered)) {
             continue;