k3s expose kubernetes dashboard through traefik ingress

ingress.yml

apiVersion: traefik.containo.us/v1alpha1
kind: ServersTransport
metadata:
  name: insecure-transport
  namespace: default
spec:
  insecureSkipVerify: true
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: "traefik"
    cert-manager.io/cluster-issuer: "letsencrypt-prod"
    traefik.ingress.kubernetes.io/service.serverstransport: "kube-sytem@insecure-transport"
  name: dashboard
  namespace: kubernetes-dashboard
spec:
  rules:
  - host: dashboard.example.com
    http:
      paths:
        - pathType: Prefix
          path: "/"
          backend:
            service:
              name: kubernetes-dashboard
              port:
                number: 443
  tls:
  - hosts:
    - dashboard.example.com
    secretName: dashboard-ingress-cert