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Read the VPN server IP address from the monitoring node config

Merged Read the VPN server IP address from the monitoring node config
207.reuse-vpn-server-ip-configuration into 207.payment-server-exception-reporting-update
Merged Jean-Paul Calderone requested to merge 207.reuse-vpn-server-ip-configuration into 207.payment-server-exception-reporting-update
  1. Feb 10, 2022
    • Jean-Paul Calderone's avatar
      Read the VPN server IP address from the monitoring node config · 0eee7f76
      Jean-Paul Calderone authored 
      morph offers an auto-passed `nodes` parameter from which we can read all of
the nodes in the morph "network".  We can dig around in this to find the
monitoring node and then read its configured IP address.

It may be worth noting that this address appears in at least two places in the
configuration.  It appears in our "input" configuration which grid.nix
defines.  This change reads it from there.  We also have a NixOS module
`nixos/modules/monitoring/vpn/server.nix` which reads this "input" and uses it
to configure `networking.wireguard.interfaces.monitoringvpn`.  This is fed
onwards to <nixos> to generate actual system configuration.

It seems better to use the former than the latter because we have more direct
control over it and if we consider the whole configuration system a function
then it is more like an argument we are supplying rather than an obscure
implementation detail.
      0eee7f76