Showcase a DNS server with separate door servers for each DNS zone

[robertdfrench]

The idea being that the DNS server can host records for multiple different zones (belonging to different customers), and that each customer could update their records independently.

sequenceDiagram
  participant DNS Client
  participant DNS Server
  participant example.org Server
  participant example.org Admin
  example.org Admin->>example.org Server: door_call(SET a = 1.2.3.4)
  DNS Client->>DNS Server: udp(LOOKUP a.example.org)
  DNS Server->>example.org Server: door_call(GET a)

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