/// <summary>
/// Uses credentials to login to a registry.
/// </summary>
/// <param name="server">The ip or dns to the server (with optioanl :port)</param>
/// <param name="user">An optional user to use when logging in.</param>
/// <param name="password">An optional password to user when logging in.</param>
/// <returns>Itself for fluent access.</returns>
public ContainerBuilder WithCredential(string server, string user = null, string password = null)
{
_repositoryBuilder = new RepositoryBuilder(server, user, password);
return(this);
}