cluster.fun/manifests/certmanager_chart.yaml

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

---

apiVersion: helm.fluxcd.io/v1
kind: HelmRelease
metadata:
  name: cert-manager
  namespace: cert-manager
spec:
  chart:
    repository: https://charts.jetstack.io
    name: cert-manager
    version: v0.15.0
  maxHistory: 5
  values:
    installCRDs: "true"
    resources:
      requests:
        cpu: 10m
        memory: 32Mi
      limits:
        cpu: 20m
        memory: 64Mi

---

apiVersion: cert-manager.io/v1alpha2
kind: ClusterIssuer
metadata:
  name: letsencrypt
spec:
  acme:
    server: https://acme-v02.api.letsencrypt.org/directory
    email: letsencrypt@marcusnoble.co.uk
    privateKeySecretRef:
      name: letsencrypt
    solvers:
    - selector: {}
      http01:
        ingress:
          class: traefik