k8s-operator-adventures kubebuilder guide https://betterprogramming.pub/build-a-kubernetes-operator-in-10-minutes-11eec1492d30 https://github.com/leovct/kubernetes-operator-tutorial operator-sdk guide https://developers.redhat.com/articles/2021/09/07/build-kubernetes-operator-six-steps#setup_and_prerequisites Building CronJob with an operator https://book.kubebuilder.io/architecture.html https://book.kubebuilder.io/cronjob-tutorial/cronjob-tutorial.html