cache_valid_time to apt module calls
diff --git a/roles/dns-unbound/tasks/unbound-Debian.yml b/roles/dns-unbound/tasks/unbound-Debian.yml
index da0254f..f878858 100644
--- a/roles/dns-unbound/tasks/unbound-Debian.yml
+++ b/roles/dns-unbound/tasks/unbound-Debian.yml
@@ -4,6 +4,8 @@
   apt:
     name={{ item }}
     state=present
+    update_cache=yes
+    cache_valid_time=3600
   with_items:
     - unbound