Added terraform support for Exoscale (#7141)

* Added terraform support for Exoscale

* Fixed markdown lint error on exoscale terraform

contrib/terraform/exoscale/modules/kubernetes-cluster/variables.tf

@@ -0,0 +1,40 @@
+variable "zone" {
+  type = string
+  # This is currently the only zone that is supposed to be supporting
+  # so called "managed private networks".
+  # See: https://www.exoscale.com/syslog/introducing-managed-private-networks
+  default = "ch-gva-2"
+}
+
+variable "prefix" {}
+
+variable "machines" {
+  type = map(object({
+    node_type = string
+    size      = string
+    boot_disk = object({
+      image_name                = string
+      root_partition_size       = number
+      ceph_partition_size       = number
+      node_local_partition_size = number
+    })
+  }))
+}
+
+variable "ssh_pub_key" {}
+
+variable "ssh_whitelist" {
+  type = list(string)
+}
+
+variable "api_server_whitelist" {
+  type = list(string)
+}
+
+variable "nodeport_whitelist" {
+  type = list(string)
+}
+
+variable "private_network_cidr" {
+  default = "172.0.10.0/24"
+}