some slight changes

hosts/ds9/custom-caddy.nix

@@ -0,0 +1,47 @@
+{ pkgs, ... }:
+
+with pkgs;
+
+caddy.override {
+  buildGoModule = args: buildGoModule (args // {
+    src = stdenv.mkDerivation rec {
+      pname = "caddy-using-xcaddy-${xcaddy.version}";
+      inherit (caddy) version;
+
+      dontUnpack = true;
+      dontFixup = true;
+
+      nativeBuildInputs = [
+        cacert
+        go
+      ];
+
+      plugins = [
+        "github.com/caddy-dns/ionos@751e8e24162290ee74bea465ae733a2bf49551a6"
+      ];
+
+      configurePhase = ''
+        export GOCACHE=$TMPDIR/go-cache
+        export GOPATH="$TMPDIR/go"
+        export XCADDY_SKIP_BUILD=1
+      '';
+
+      buildPhase = ''
+        ${xcaddy}/bin/xcaddy build "${caddy.src.rev}" ${lib.concatMapStringsSep " " (plugin: "--with ${plugin}") plugins}
+        cd buildenv*
+        go mod vendor
+      '';
+
+      installPhase = ''
+        cp -r --reflink=auto . $out
+      '';
+
+      outputHash = "sha256-QsGrtpBJ9b2Nn3i5mUHYA60481ceTJDeCRl0qL6OWlE=";
+      outputHashMode = "recursive";
+    };
+
+    subPackages = [ "." ];
+    ldflags = [ "-s" "-w" ]; ## don't include version info twice
+    vendorHash = null;
+  });
+}