code: func loadProfile() string {
  	p := ""
  	if len(*profile) == 0 {
  		//Load application profile from environment variable
  		p = os.Getenv("GC_PROFILE")
  	} else {
  		p = *profile
  	}
  	return s.ToLower(p)
  }
docs: // If no profile is specified then it uses the default profile and load the config
  // data that's marked as default.
  // Profile can be set using 2 ways:
  // 1. Environment variable 'GC_PROFILE' eg: export GC_PROFILE='dev'
  // 2. Command line argument 'profile' eg: go run myserver.go -profile=dev