Allow install|update scripts in Drupal8+ (#599)

Author: DionisioFG

roles/nginx/templates/drupal8.j2

@@ -1,7 +1,11 @@
 ######### Default block.
 
 # Generic rewrite rule.
-    location @rewrite {
+location @rewrite {
     rewrite ^ /index.php?$query_string;
 }
+# Allow install/update for local stack for Drupal8+.
+location ~ ^/core/(install|update).php$ {
+    try_files @phpprocess @phpprocess;
+}
 include "/etc/nginx/conf.d/drupal_common";