symfony-kube-skeletor/misc/k8s/kustomization/base/components/app-cnpg/resources/app-cnpg-cluster.yaml

apiVersion: postgresql.cnpg.io/v1
kind: Cluster
metadata:
  name: app-postgres
spec:
  instances: 3
  primaryUpdateStrategy: unsupervised
  superuserSecret:
    name: app-postgres-admin
  bootstrap:
    initdb:
      database: app
      owner: app
      secret:
        name: app-postgres-user
  storage:
    size: 20Gi