apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: default-run-as-non-root
spec:
  background: true

  rules:

    - name: default-pod-run-as-non-root
      match:
        any:
          - resources:
              kinds:
                - Pod

      mutate:
        patchStrategicMerge:
          spec:
            securityContext:
              +(runAsNonRoot): true

    - name: default-container-run-as-non-root
      match:
        any:
          - resources:
              kinds:
                - Pod

      mutate:
        foreach:
          - list: "request.object.spec.containers"
            patchStrategicMerge:
              spec:
                containers:
                  - (name): "{{ element.name }}"
                    securityContext:
                      +(runAsNonRoot): true

          - list: "request.object.spec.initContainers || []"
            patchStrategicMerge:
              spec:
                initContainers:
                  - (name): "{{ element.name }}"
                    securityContext:
                      +(runAsNonRoot): true