fix: Use include and not include_once because software sucks.

Refs: OPS-11376

docker/settings.php

@@ -35,7 +35,7 @@
 // @TODO: Use some sort of key/value store.
 if (file_exists('/srv/www/shared/settings')) {
   foreach (glob('/srv/www/shared/settings/settings.*.php') as $filename) {
-    include_once $filename;
+    include $filename;
   }
 }