forgot to change the username to ubuntu :(

CICD/heat/gc_HOT.yaml

@@ -225,7 +225,7 @@ resources:
       security_groups: [ default, { get_resource: SSHMonashSecGroup }, { get_resource: SlurmSecGroup }, { get_resource: NFSSecGroup } ]
       metadata:
        ansible_host_groups: [ ComputeNodes ]
-       ansible_ssh_user: ec2-user
+       ansible_ssh_user: ubuntu
        project_name: { get_param: project_name }
       networks:
        - network: { get_param: NetID }