setUsernamewithGenPass.yaml

apiVersion: v1
kind: Secret
metadata:
  name: user-creds
type: Opaque
stringData:
  username: test
---
apiVersion: rabbitmq.com/v1beta1
kind: User
metadata:
  name: set-username-gen-pass-example
spec:
  tags:
  - management
  rabbitmqClusterReference:
    name: test # rabbitmqCluster must exist in the same namespace as this resource
  importCredentialsSecret:
    name: user-creds