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type Opt struct {
	PipeFDEnvKey     string               // needs to be set
	StateDir         string               // directory needs to be precreated
	StateDirEnvKey   string               // optional env key to propagate StateDir value
	NetworkDriver    network.ParentDriver // nil for HostNetwork
	PortDriver       port.ParentDriver    // nil for --port-driver=none
	PublishPorts     []port.Spec
	CreatePIDNS      bool
	ParentEUIDEnvKey string // optional env key to propagate geteuid() value
	ParentEGIDEnvKey string // optional env key to propagate getegid() value
	Propagation      string
}