add-default-resources.yaml

apiVersion : kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: add-default-resources
spec:
  background: false
  rules:
  - name: add-default-requests
    match:
      any:
      - resources:
          kinds:
          - Pod
    preconditions:
      any:
      - key: "{{request.operation}}"
        operator: AnyIn
        value:
        - CREATE
        - UPDATE
    mutate:
      patchStrategicMerge:
        spec:
          containers:
            - (name): "*"
              resources:
                requests:
                  +(memory): "100Mi"
                  +(cpu): "100m"