Set mode on crontab correctly

postgres/tasks/main.yml

@@ -42,7 +42,7 @@
     - config
 
 - name: ensure rsnapshot is running regularly
-  copy: src=crontab dest=/var/spool/cron/crontabs/root owner=root group=root mode=0644
+  copy: src=crontab dest=/var/spool/cron/crontabs/root owner=root group=root mode=0600
   tags:
     - postgres
     - rsnapshot