Create on-demand node group on Amazon EKS.

def create_node_group(self):
        """Create on-demand node group on Amazon EKS.
        """
        self.create_stack(
            self.node_group_name,
            'amazon-eks-nodegroup.yaml',
            capabilities=['CAPABILITY_IAM'],
            parameters=define_parameters(
                ClusterName=self.cluster_name,
                ClusterControlPlaneSecurityGroup=self.security_groups,
                Subnets=self.subnet_ids,
                VpcId=self.vpc_ids,
                KeyName=self.ssh_key_name,
                NodeAutoScalingGroupMaxSize="1",
                NodeVolumeSize="100",
                NodeImageId="ami-0a54c984b9f908c81",
                NodeGroupName=f"{self.name} OnDemand Nodes"
            )
        )