nginx: make the file world readable. no need for useless secrets

Signed-off-by: Mattia Rizzolo <mattia@debian.org>

roles/nginx/tasks/setup.yml

@@ -36,7 +36,7 @@
   template:
     src: firewall.sh
     dest: /etc/firewall/nginx.sh
-    mode: 0700
+    mode: 0744
 
   notify:
     - common.reload-firewall