Add trusted host pattern to settings.php in D8

templates/d8_settings.php

@@ -37,6 +37,9 @@ $settings['file_private_path'] = 'sites/{{ item.shortname|default("default") }}/
 {% for config in item.conf|default([]) %}
 $settings['{{ config.key }}'] = {{ config.value }};
 {% endfor %}
+$settings['trusted_host_patterns'] = array(
+  '^{{ item.domain|regex_escape() }}$',
+);
 
 # TODO: The following doesn't work yet
 # TODO: Make sure that inside jail we point to '/tmp' directly