tekton-example-pipeline/tekton-pipeline/triggers/certificate.yaml

apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: argocd-app
  namespace: argocd
spec:
  dnsNames:
    - k8s-argocd.tk
  secretName: argocd-app-tls
  issuerRef:
    name: letsencrypt-cluster-issuer
    kind: ClusterIssuer