🖼️ Change openstack image selection mechanism

Instead of passing an image name through a terraform variable,
use tags to select the latest image matching the specified
tags (in this case, os=Ubuntu version=22.04).

prepare-labs/terraform/virtual-machines/openstack/main.tf

@@ -1,14 +1,22 @@
 resource "openstack_compute_instance_v2" "_" {
   for_each    = local.nodes
   name        = each.value.node_name
-  image_name  = var.image
+  image_name  = data.openstack_images_image_v2._.name
   flavor_name = each.value.node_size
-  key_pair = openstack_compute_keypair_v2._.name
+  key_pair    = openstack_compute_keypair_v2._.name
   network {
     port = openstack_networking_port_v2._[each.key].id
   }
 }
 
+data "openstack_images_image_v2" "_" {
+  most_recent = true
+  properties = {
+    os      = "ubuntu"
+    version = "22.04"
+  }
+}
+
 resource "openstack_networking_port_v2" "_" {
   for_each              = local.nodes
   network_id            = openstack_networking_network_v2._.id

prepare-labs/terraform/virtual-machines/openstack/provider.tf

@@ -31,10 +31,6 @@ variable "external_network_id" {
   type = string
 }
 
-variable "image" {
-  type = string
-}
-
 variable "node_sizes" {
   type    = map(any)
   default = {}