cache_valid_time to apt module calls
diff --git a/roles/common-prep/tasks/main.yml b/roles/common-prep/tasks/main.yml
index 1ea1ad9..409a179 100644
--- a/roles/common-prep/tasks/main.yml
+++ b/roles/common-prep/tasks/main.yml
@@ -19,7 +19,11 @@
     - wait for host
 
 - name: Install standard packages
-  apt:  pkg={{ item }} state=present
+  apt:
+    pkg={{ item }}
+    state=present
+    update_cache=yes
+    cache_valid_time=3600
   with_items:
    - tmux
    - vim