Set DNS for deployment (in cloudflare)

[rufuspollock]

• Set up / update DNS for API and frontend

https://api.cloudflare.com/#dns-records-for-a-zone-create-dns-record

TODO

• When do we do this (e.g. is this part of the deploy script or should it be invoked separately?)
  • It is only needed rarely e.g. on first creation or when we change the node cluster in some way and the IP changes ...
  • May be pretty low cost to do though ...
  • But requires users to have cloudflare API - which maybe not all admins have => have it separate

## Analysis

• New config variable for cloudflare API login info
• Script to change (do we hvae to check it exists or not to separate create / update)