taskotron-dev: try a better way to deploy cron files

roles/taskotron/grokmirror/tasks/main.yml

@@ -53,3 +53,13 @@
     special_time=hourly
     job="cd {{ grokmirror_basedir }}/{{ item.name }} && git fetch origin {{ grokmirror_default_branch }}:{{ grokmirror_default_branch }}"
   with_items: "{{ grokmirror_repos }}"
+  when: deployment_type in ['stg', 'prod']
+
+- name: install cron jobs to update repos
+  template:
+    src: grokmirror-update-repos.cron.j2
+    dest: /etc/cron.d/grokmirror-update-repos.cron
+    owner: root
+    group: root
+    mode: 0644
+  when: deployment_type in ['dev']