call kube::golang::setup_env before setting up worktree

hack/verify-internal-modules.sh

@@ -22,6 +22,8 @@ KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
 source "${KUBE_ROOT}/hack/lib/init.sh"
 
 kube::util::ensure_clean_working_dir
+# This sets up the environment, like GOCACHE, which keeps the worktree cleaner.
+kube::golang::setup_env
 
 _tmpdir="$(kube::realpath "$(mktemp -d -t verify-internal-modules.XXXXXX)")"
 #kube::util::trap_add "rm -rf ${_tmpdir}" EXIT