This is my current attempt:

            pkgs.runCommand "ginkgo" {
              nativeBuildInputs = [
                pkgs.go
              ];
            } ''
              export HOME=$(pwd)
              export GO111MODULE=off
              export GOPATH=$out
              mkdir -p $GOPATH

              ln -s ${packages.go-babel.goModules} $out/src

              go install -v -n -a github.com/onsi/ginkgo/v2/ginkgo

              # mkdir -p $out/bin
              # ls -l /build/bin/
              # mv /build/bin/ginkgo $out/bin
            '';