fix CI rebuild of compute nodes

Author: sjpb

ansible/ci/test_reimage.yml

@@ -45,10 +45,10 @@
   gather_facts: no
   tags: reimage_compute
   tasks:
-    # TODO: This is specific to smslabs/arcus environment config - could generalise to all compute nodes
+    # TODO: This is specific to arcus environment config - could generalise to all compute nodes
     - name: Request compute node rebuild via Slurm
       shell:
-        cmd: scontrol reboot ASAP nextstate=RESUME reason='rebuild image:{{ compute_build.artifact_id }}' {{ openhpc_cluster_name }}-compute-[0-1]
+        cmd: scontrol reboot ASAP nextstate=RESUME reason='rebuild image:{{ compute_build.artifact_id }}' {{ openhpc_cluster_name }}-compute-[0-3]
       become: yes
 
     - name: Check compute node rebuild completed