WAN and VPN requests are served by local port 1053 and `wan.uninsane.org`.
LAN requests are served by port 53 and `servo.lan.uninsane.org`.
i'm not *super* fond of this. a recursive resolver of uninsane.org via the VPN will only ever get WAN addresses (broken).
we may prefer to do IP-based responses, maybe via the same Linux firewall rules that forward from VPN namespace to root namespace
longer-term, i want hosts/by-name to define host-specific data
that's accessible via the other hosts (things like pubkeys).
also the secrets management needs some rethinking. there's really not
much point in me specifiying where *exactly* a secret comes from at its
use site. i should really be specifying secret store manifests; i.e.
"servo.yaml contains secrets X Y and Z", and leaving the rest up to
auto-computing.
