code: func (s *Sandbox) SetInfraContainer(infraCtr *oci.Container) error {
  	if s.infraContainer != nil {
  		return fmt.Errorf("sandbox already has an infra container")
  	} else if infraCtr == nil {
  		return fmt.Errorf("must provide non-nil infra container")
  	}
  
  	s.infraContainer = infraCtr
  
  	return nil
  }
docs: // SetInfraContainer sets the infrastructure container of a sandbox
  // Attempts to set the infrastructure container after one is already present will throw an error