clanServices/mycelium: add networking export

clanServices/mycelium/default.nix

@@ -1,4 +1,9 @@
-{ ... }:
+{
+  lib,
+  clanLib,
+  directory,
+  ...
+}:
 {
   _class = "clan.service";
   manifest.name = "clan-core/mycelium";
@@ -30,8 +35,24 @@
       };
 
     perInstance =
-      { settings, ... }:
       {
+        settings,
+        roles,
+        ...
+      }:
+      {
+
+        exports.networking = {
+          peers = lib.mapAttrs (name: _machine: {
+            host.plain = clanLib.vars.getPublicValue {
+              machine = name;
+              generator = "mycelium";
+              file = "ip";
+              flake = directory;
+            };
+          }) roles.peer.machines;
+        };
+
         nixosModule =
           {
             config,