code: func (mtask *managedTask) releaseIPInIPAM() {
  	if mtask.ENI == nil {
  		return
  	}
  	seelog.Infof("Managed task [%s]: IPAM releasing ip for task eni", mtask.Arn)
  
  	cfg, err := mtask.BuildCNIConfig()
  	if err != nil {
  		seelog.Warnf("Managed task [%s]: failed to release ip; unable to build cni configuration: %v",
  			mtask.Arn, err)
  		return
  	}
  	err = mtask.cniClient.ReleaseIPResource(cfg)
  	if err != nil {
  		seelog.Warnf("Managed task [%s]: failed to release ip; IPAM error: %v",
  			mtask.Arn, err)
  		return
  	}
  }
docs: // releaseIPInIPAM releases the ip used by the task for awsvpc