cluster.fun/manifests/certmanager_chart/certmanager_chart.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: cert-manager
  labels:
    certmanager.k8s.io/disable-validation: "true"

---

apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: letsencrypt
spec:
  acme:
    server: https://acme-v02.api.letsencrypt.org/directory
    email: letsencrypt@marcusnoble.co.uk
    privateKeySecretRef:
      name: letsencrypt
    solvers:
    - http01:
        ingress:
          class: nginx