Add cron job to refresh cache
Add cron job to refresh cache

I went for 1 hour as that is the current refresh
rate for caches.

https://trello.com/c/knffA0Fb/786-import-the-new-topic-registry-on-a-schedule-s

alphagov/finder-frontend,alphagov/finder-frontend,alphagov/finder-frontend,alphagov/finder-frontend