https://discourse.nixos.org/t/build-caddy-with-modules-in-devenv-shell/25125/4

caddy-with-plugins.nix

{ pkgs, config, ... }:

with pkgs; stdenv.mkDerivation rec {
    pname = "caddy";
    version = "2.6.2";
    dontUnpack = true;

    nativeBuildInputs = [ git go xcaddy ];

    configurePhase = ''
        export GOCACHE=$TMPDIR/go-cache
        export GOPATH="$TMPDIR/go"
    '';

    buildPhase = ''
      runHook preBuild
      ${xcaddy}/bin/xcaddy build "v${version}" --with github.com/caddy-dns/porkbun
      runHook postBuild
    '';

    installPhase = ''
      runHook preInstall
      mkdir -p $out/bin
      mv caddy $out/bin
      runHook postInstall
    '';
};