Now able to set temp path in D8 settings.php

templates/d8_settings.php

@@ -45,9 +45,7 @@ $settings['trusted_host_patterns'] = array(
 {% endfor %}
 );
 
-# TODO: The following doesn't work yet
-# TODO: Make sure that inside jail we point to '/tmp' directly
-$config['system.file']['path.temporary'] = '{% if drupal.jail is defined %}{{ jailroot }}/{{ drupal.jail.name }}{% endif %}/tmp';
+$config['system.file']['path']['temporary'] = '{% if drupal.jail is defined %}{{ jailroot }}/{{ drupal.jail.name }}{% endif %}/tmp';
 
 {% for directory in drupal_config_directories %}
 $config_directories['{{ directory }}'] = 'sites/{{ item.shortname|default("default") }}/files/{{ item.config|default("config") }}/{{ directory }}';