Add imagePullSecrets for Containers and InitContainers

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: add-imagepullsecrets-for-containers-and-initcontainers
  annotations:
    policies.kyverno.io/title: Add imagePullSecrets for Containers and InitContainers
    policies.kyverno.io/category: Sample
    policies.kyverno.io/subject: Pod
    policies.kyverno.io/minversion: 1.6.0
    kyverno.io/kyverno-version: 1.6.2
    kyverno.io/kubernetes-version: "1.23"
    policies.kyverno.io/description: Images coming from certain registries require authentication in order to pull them, and the kubelet uses this information in the form of an imagePullSecret to pull those images on behalf of your Pod. This policy searches for images coming from a registry called `corp.reg.com` referenced by either one of the containers or one  of the init containers and, if found, will mutate the Pod to add an imagePullSecret called `my-secret`.
spec:
  rules:
    - name: add-imagepullsecret
      match:
        any:
          - resources:
              kinds:
                - Pod
      preconditions:
        any:
          - key: corp.reg.com
            operator: AnyIn
            value: "{{ images.initContainers.*.registry || `[]` }}"
          - key: corp.reg.com
            operator: AnyIn
            value: "{{ images.containers.*.registry }}"
      mutate:
        patchStrategicMerge:
          spec:
            imagePullSecrets:
              - name: my-secret