move arrs into nix container

modules/apps/caddy/custom-caddy.nix

@@ -0,0 +1,43 @@
+{
+  pkgs,
+  config,
+  plugins,
+  stdenv,
+  lib,
+  ...
+}:
+
+stdenv.mkDerivation rec {
+  pname = "caddy";
+  # https://github.com/NixOS/nixpkgs/issues/113520
+  version = "2.7.6";
+  dontUnpack = true;
+
+  nativeBuildInputs = [
+    pkgs.git
+    pkgs.go
+    pkgs.xcaddy
+  ];
+
+  configurePhase = ''
+    export GOCACHE=$TMPDIR/go-cache
+    export GOPATH="$TMPDIR/go"
+  '';
+
+  buildPhase =
+    let
+      pluginArgs = lib.concatMapStringsSep " " (plugin: "--with ${plugin}") plugins;
+    in
+    ''
+      runHook preBuild
+      ${pkgs.xcaddy}/bin/xcaddy build "v${version}" ${pluginArgs}
+      runHook postBuild
+    '';
+
+  installPhase = ''
+    runHook preInstall
+    mkdir -p $out/bin
+    mv caddy $out/bin
+    runHook postInstall
+  '';
+}