For now, store image ids in defaults

ansible/roles/cloud/defaults/main.yaml

+image: debian12
+
 # Defaults for Hetzner cloud
 hcloud_type: cx11
-hcloud_image: debian-12
 hcloud_region: eu-central
+hcloud_images:
+  debian12: debian-12
 
 # Defaults for Scaleway cloud
 scaleway_type: PLAY2-NANO
-scaleway_image: c1161979-ce89-46c9-941e-ebbb6514d528  # This is Debian 12
 scaleway_region: par1
+scaleway_images:
+  debian12: c1161979-ce89-46c9-941e-ebbb6514d528

ansible/roles/cloud/tasks/hcloud.yaml

@@ -3,7 +3,7 @@
     api_token: "{{ hcloud_token }}"
     name: "{{ node_prefix }}-{{ item.key }}"
     server_type: "{{ hcloud_type }}"
-    image: "{{ hcloud_image }}"
+    image: "{{ hcloud_images[image] }}"
     location: "{{ hcloud_region }}"
     ssh_keys:
     - "{{ hcloud_ssh_key }}"

ansible/roles/cloud/tasks/scaleway.yaml

@@ -3,7 +3,7 @@
     api_token: "{{ scaleway_token }}"
     name: "{{ node_prefix }}-{{ item.key }}"
     commercial_type: "{{ scaleway_type }}"
-    image: "{{ scaleway_image }}"
+    image: "{{ scaleway_images[image] }}"
     project: "{{ scaleway_project }}"
     region: "{{ scaleway_region }}"
     enable_ipv6: true
@@ -17,7 +17,7 @@
     api_token: "{{ scaleway_token }}"
     name: "{{ node_prefix }}-{{ item.key }}"
     commercial_type: "{{ scaleway_type }}"
-    image: "{{ scaleway_image }}"
+    image: "{{ scaleway_images[image] }}"
     project: "{{ scaleway_project }}"
     region: "{{ scaleway_region }}"
     state: running