bundles/pacman: enable paccache.timer to clean up old package versions

bundles/pacman/items.py

@@ -9,7 +9,11 @@ files = {
     },
 }
 
-# This is more targeted to GUI systems. This is intentional.
+svc_systemd['paccache.timer'] = {
+    'needs': {
+        'pkg_pacman:pacman-contrib',
+    },
+}
 
 pkg_pacman = {
     'at': {},
@@ -48,6 +52,7 @@ pkg_pacman = {
     'mtr': {},
     'ncdu': {},
     'nmap': {},
+    'pacman-contrib': {},
     'patch': {},
     'pkgconf': {},
     'python': {},