Add image data source in nodes module

To avoid error when there's two images with same name
 use data source to get the latest image to boot up compute nodes

nodes/main.tf

@@ -10,11 +10,16 @@ variable "key_pair" {type = "string"}
 variable "compute_node_count" { }
 variable "internal_network" {}
 
+data "openstack_images_image_v2" "compute" {
+  name = var.image_compute
+  most_recent = true
+}
+
 # creates compute node
 resource "openstack_compute_instance_v2" "compute" {
   depends_on      = [var.internal_subnet_id]
   name            = "c${count.index}"
-  image_name      = var.image_compute
+  image_id        = data.openstack_images_image_v2.compute.id
   flavor_name     = var.flavor
   key_pair        = var.key_pair
   security_groups = ["default"]
@@ -39,6 +44,10 @@ output "id" {
   value = openstack_compute_instance_v2.compute.*.id
 }
 
+output "image_id" {
+  value = data.openstack_images_image_v2.compute.id
+}
+
 output "network" {
   value = zipmap(openstack_compute_instance_v2.compute.*.name, openstack_compute_instance_v2.compute.*.network)
 }