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.

Should be pure refactoring

Note that changing the origin repository in the on-node deployment checkout
is also required.

See https://whetstone.private.storage/privatestorage/privatestorageops/-/merge_requests/197#note_19071

now all nodes load the issuer module so we can always supply issuer
configuration, where it makes sense to do so, even on systems where the issuer
is not going to be enabled.

if that sounds silly read the comment in default.nix