type AuthConfig struct {
	Username string `json:"username,omitempty"`
	Password string `json:"password,omitempty"`
	Auth     string `json:"auth,omitempty"`

	// Email is an optional value associated with the username.
	// This field is deprecated and will be removed in a later
	// version of docker.
	Email string `json:"email,omitempty"`

	ServerAddress string `json:"serveraddress,omitempty"`

	// IdentityToken is used to authenticate the user and get
	// an access token for the registry.
	IdentityToken string `json:"identitytoken,omitempty"`

	// RegistryToken is a bearer token to be sent to a registry
	RegistryToken string `json:"registrytoken,omitempty"`
}