pre-router: remove unbound, use quad9

hosts/pre-router/dns.nix

@@ -6,35 +6,15 @@
     enable = true;
     config = ''
       .:53 {
+        errors
         log
         cache
-        unbound
+        prometheus 10.42.10.8:9253
+        forward . tls://2620:fe::fe tls://9.9.9.9 tls://2620:fe::9 tls://149.112.112.112 {
+          tls_servername dns.quad9.net
+          health_check 5s
+        }
       }
     '';
-    package = lib.fix (self: (pkgs.buildGoModule {
-      inherit (pkgs.coredns) pname version src postPatch;
-
-      patches = pkgs.coredns.patches or [ ] ++ [
-        ./coredns-unbound.patch
-      ];
-
-      buildInputs = [ pkgs.unbound ];
-
-      vendorSha256 = "sha256-48S1oT+5uT6d+AM8u93AOTbJkW3CLtaowGv+th3cfyM=";
-
-      preBuild = ''
-        go generate
-
-        postInstall () {
-          cp go.mod $out
-        }
-      '';
-
-    }).overrideAttrs(old: {
-      preBuild = ''
-        cp ${self.passthru.go-modules}/go.mod .
-        go generate
-      '';
-    }));
   };
 }