Added Thingvellir nomad volumes

modules/server/nomad.nix

@@ -13,6 +13,12 @@ in
       description = "Set to true if configured a server - otherwise a client is assumed";
     };
 
+    host-config = lib.mkOption {
+      type = lib.types.nullOr lib.types.path;
+      default = null;
+      description = "Additional host-specific config file";
+    };
+
   };
   config = lib.mkIf cfg.enable {
     # services.consul.enable = true;
@@ -45,6 +51,12 @@ in
         target = "nomad.d/server.json";
         source = ../../config/nomad.d/server.json;
       };
+    } // lib.optionalAttrs cfg.host-config {
+      # Host-specific configuration
+      nomad-host-cfg = {
+        target = "nomad.d/host.json";
+        source = cfg.host-config;
+      };
     };
 
     age.secrets = {