Workbench: Add gonew.

workbench/Dockerfile

@@ -259,6 +259,7 @@ RUN export GOPATH=/usr/local/lib/go && \
     go install github.com/nektos/act@latest && \
     go install github.com/nishanths/license/v5@latest && \
     go install github.com/spelufo/on-change@latest && \
+    go install golang.org/x/tools/cmd/gonew@latest && \
     go install sigs.k8s.io/kustomize/kustomize/v5@latest && \
     rm -rf /tmp/* /var/tmp/* ~/.cache/*
 # hadolint ignore=SC2263