c-kustom/base/metallb/secrets/kustomization.yaml

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
namespace: metallb-system

secretGenerator:
- name: memberlist
  literals:
  - secretkey=FiXmEiAmNoTaReAlSeCr3tAnDineedtobereplacewithapropersecretforyourinfrastruture