gateway.yaml

# /var/lib/rancher/k3s/server/manifests/traefik-config.yaml
apiVersion: helm.cattle.io/v1
kind: HelmChartConfig
metadata:
  name: traefik
  namespace: kube-system
spec:
  valuesContent: |-
    providers:
      kubernetesGateway:
        enabled: true

k3s.sh

#!/usr/bin/env bash

curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="server --disable traefik --disable servicelb" sh -

helm repo add traefik https://traefik.github.io/charts

helm install traefik traefik/traefik

# or
# helm install traefik oci://ghcr.io/traefik/helm/traefik

kubectl apply --server-side --force-conflicts -k https://github.com/traefik/traefik-helm-chart/traefik/crds/