Use volume-backed instances for testing

Author: m-bull

.github/extra_vars/arcus.yml

@@ -8,6 +8,7 @@ openhpc_slurm_partitions:
 cluster_run_validation: true
 cluster_user_ssh_public_key: ""
 home_volume_size: 20
+cluster_use_root_volumes: true
 
 # Cloud vars
 cluster_external_network: "CUDN-Internet"
@@ -17,9 +18,14 @@ metrics_db_maximum_size: 5
 
 # Image build
 image_build_manage_infra: false
+image_build_use_blockstorage_volume: true
+image_build_image_disk_format: "raw"
+image_build_volume_size: 10
+image_build_metadata:
+  hw_vif_multiqueue_enabled: "yes"
 image_build_flavor_name: "vm.ska.cpu.general.small"
 image_build_network_id: "4b6b2722-ee5b-40ec-8e52-a6610e14cc51"
 image_build_attach_floating_ip: true
 image_build_floating_ip_network: "CUDN-Internet"
-image_build_source_image_id: "519c4a1a-efdd-494e-929b-05dce43e1011"
+image_build_source_image_id: "2a77064b-be40-4065-b0f4-4d5417a4460a"
 image_build_security_group_id: "486dfc85-099b-4bbb-9375-60f320a7de18"