DNS acme cluster-issuer.yaml - third time is a charm

cluster-issuer.yaml

apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: letsencrypt-prod
  namespace: cert-manager
spec:
  acme:
    email: [email protected]
    server: https://acme-v02.api.letsencrypt.org/directory
    privateKeySecretRef:
      name: letsencrypt-prod
    solvers:
    - dns01:
         cloudflare:
           email: [email protected]
           apiKeySecretRef:
             name: cloudflare-api-key
             key: api-key