pkg/cli/env.go
func BoolEnvDef(env string, def bool) bool {
	val := os.Getenv(env)
	if val == "" {
		return def
	}
	b, err := strconv.ParseBool(val)
	if err != nil {
		return def
	}
	return b
}
func BoolEnvDef(env string, def bool) bool {
	val := os.Getenv(env)
	if val == "" {
		return def
	}
	b, err := strconv.ParseBool(val)
	if err != nil {
		return def
	}
	return b
}
// BoolEnvDef get environemnt variable and return bool.