fix(lang): expose host port

[kemingy]

Signed-off-by: Keming kemingyang@tensorchord.ai

cc @aseaday

[aseaday]

LGTM

[muniu-bot]

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[hezhizhen]

When does envd randomly choose a port?

[kemingy]

If host_port is not specified, it will use the default value 0.

[hezhizhen]

So 0 is the default value for the host port (if users do not set it) instead of an indicator of a randomly assigned value for the host port. Do I understand it correctly?

[kemingy]

• 0 is the default value
• if it's 0, envd will randomly choose a free port, user can check the host port with envd env describe --env <name>

  envd/pkg/docker/docker.go

  Lines 514 to 519 in 404de31

  	if item.HostPort == 0 {
  	item.HostPort, err = netutil.GetFreePort()
  	if err != nil {
  	return "", "", errors.Wrap(err, "failed to get a free port")
  	}
  	}