docs: 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"
              )
          )