Remove the requirement of Helm, and use the K3s HelmChart CRD installation method instead

templates/longhorn.yaml.tpl

@@ -0,0 +1,22 @@
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: longhorn
+---
+apiVersion: helm.cattle.io/v1
+kind: HelmChart
+metadata:
+  name: longhorn
+  namespace: kube-system
+spec:
+  chart: longhorn
+  repo: https://charts.longhorn.io
+  targetNamespace: longhorn
+  valuesContent: |-
+    defaultSettings:
+      defaultDataPath: /var/longhorn
+    persistence:
+      defaultFsType: ext4
+      defaultClassReplicaCount: 2
+      %{ if disable_hetzner_csi ~}defaultClass: true%{ else ~}defaultClass: false%{ endif ~}

templates/plans.yaml.tpl

@@ -47,4 +47,4 @@ spec:
   serviceAccountName: system-upgrade
   cordon: true
   upgrade:
-    image: rancher/k3s-upgrade
+    image: rancher/k3s-upgrade