Kyverno policy : Mutate pods to redirect bitnami to bitnamilegacy image repository

kyverno-clusterpolicy-mutate-image-bitnami-to-bitnamilegacy.yaml

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: replace-bitnami-image-repository-with-bitnamilegacy
  annotations:
    policies.kyverno.io/title: Replace Bitnami Image Repository With Bitnami Legacy
    pod-policies.kyverno.io/autogen-controllers: none
    policies.kyverno.io/subject: Pod
spec:
  rules:
    - name: redirect-bitnami-to-bitnamilegacy
      match:
        any:
          - resources:
              kinds:
                - Pod
              operations:
                - CREATE
                - UPDATE
      mutate:
        foreach:
          - list: request.object.spec.initContainers[]
            context:
              - name: imageData
                imageRegistry:
                  reference: "{{ element.image }}"
            preconditions:
              any:
                - key: "{{ regex_match('^(docker\\.io)/(bitnami)/(.*)$', '{{element.image}}') }}"
                  operator: Equals
                  value: true
            patchStrategicMerge:
              spec:
                initContainers:
                  - name: "{{ element.name }}"
                    image: "{{ regex_replace_all('^(docker\\.io)/(bitnami)/(.*)$', '{{element.image}}', '$1/bitnamilegacy/$3' )}}"
          - list: request.object.spec.containers[]
            context:
              - name: imageData
                imageRegistry:
                  reference: "{{ element.image }}"
            preconditions:
              any:
                - key: "{{ regex_match('^(docker\\.io)/(bitnami)/(.*)$', '{{element.image}}') }}"
                  operator: Equals
                  value: true
            patchStrategicMerge:
              spec:
                containers:
                  - name: "{{ element.name }}"
                    image: "{{ regex_replace_all('^(docker\\.io)/(bitnami)/(.*)$', '{{element.image}}', '$1/bitnamilegacy/$3' )}}"

Probably not perfect, it only handle image source in docker.io/bitnami/xxx format.
It only apply on new or updated pods, not on existing ones. A restart on StatefulSet/Deploy, or a change on Pod object is needed.