💻️ Add image setting for OpenStack TF infra template

prepare-vms/infra/example.openstack-tf

@@ -8,3 +8,4 @@ export TF_VAR_domain="Default"
 export TF_VAR_password="..."
 export TF_VAR_auth_url="https://api.r1.nxs.enix.io/v3"
 export TF_VAR_flavor="GP1.S"
+export TF_VAR_image="Ubuntu 20.04.1"

prepare-vms/terraform/machines.tf

@@ -1,7 +1,7 @@
 resource "openstack_compute_instance_v2" "machine" {
   count           = "${var.count}" 
   name            = "${format("%s-%04d", "${var.prefix}", count.index+1)}"
-  image_name      = "Ubuntu 18.04.4 20200324"
+  image_name      = "${var.image}"
   flavor_name     = "${var.flavor}"
   security_groups = ["${openstack_networking_secgroup_v2.full_access.name}"]
   key_pair        = "${openstack_compute_keypair_v2.ssh_deploy_key.name}"
@@ -30,3 +30,5 @@ output "ip_addresses" {
 }
 
 variable "flavor" {}
+
+variable "image" {}

prepare-vms/terraform/vars.tf

@@ -5,4 +5,3 @@ variable "prefix" {
 variable "count" {
   type = "string"
 }
-