add ssh variable

contrib/terraform/hetzner/modules/kubernetes-cluster-flatcar/variables.tf

@@ -1,5 +1,4 @@
 
-variable "ssh_private_key_path" {}
 variable "zone" {
   type = string
   default = "fsn1"
@@ -21,6 +20,11 @@ variable "ssh_public_keys" {
   type = list(string)
 }
 
+variable "ssh_public_keys" {
+  type    = string
+  default = "~/.ssh/id_rsa"
+}
+
 variable "ssh_whitelist" {
   type = list(string)
 }

contrib/terraform/hetzner/variables.tf

@@ -28,6 +28,7 @@ variable "ssh_public_keys" {
 variable "ssh_private_key_path" {
   description = "Private SSH key which connect to the VMs."
   type        = string
+  default     = "~/.ssh/id_rsa"
 }
 
 variable "ssh_whitelist" {