fix: move dns configuration into module

nix/modules/dns.nix

@@ -0,0 +1,39 @@
+{
+  lib,
+  config,
+  ...
+}:
+{
+  options.dns = {
+    enable = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = "enable dns";
+    };
+  };
+
+  config = lib.mkIf config.dns.enable {
+    networking.networkmanager = {
+      enable = true;
+      dns = "systemd-resolved";
+    };
+
+    services.resolved = {
+      enable = true;
+      fallbackDns = [
+        "1.1.1.1"
+        "1.0.0.1"
+      ];
+      domains = [
+        "consul"
+        "service.consul"
+        "node.consul"
+      ];
+      extraConfig = ''
+        [Resolve]
+        DNS=192.168.20.5:8600
+      '';
+    };
+
+  };
+}