Add s3 region to docs & move system-upgrade-controller to variables

kube.tf.example

@@ -418,6 +418,7 @@ module "kube-hetzner" {
   #   etcd-s3-access-key      = "<access-key>"
   #   etcd-s3-secret-key      = "<secret-key>"
   #   etcd-s3-bucket          = "k3s-etcd-snapshots"
+  #   etcd-s3-region          = "<your-s3-bucket-region|usually required for aws>"
   # }
 
   # To enable Hetzner Storage Box support, you can enable csi-driver-smb, default is "false".

locals.tf

@@ -109,7 +109,7 @@ locals {
         patch = <<-EOF
           - op: replace
             path: /spec/template/spec/containers/0/image
-            value: rancher/system-upgrade-controller:v0.14.2
+            value: rancher/system-upgrade-controller:${var.sys_upgrade_controller_version}
         EOF
       },
       {

variables.tf

@@ -1124,3 +1124,10 @@ variable "keep_disk_cp" {
   default     = false
   description = "Whether to keep OS disks of nodes the same size when upgrading a control-plane node"
 }
+
+
+variable "sys_upgrade_controller_version" {
+  type        = string
+  default     = "v0.13.4"
+  description = "Whether to keep OS disks of nodes the same size when upgrading a control-plane node"
+}