/**
* Adds an additional tag to tag the target image with. For example, the following would
* containerize to both {@code gcr.io/my-project/my-image:tag} and {@code
* gcr.io/my-project/my-image:tag2}:
*
* <pre>{@code
* Containerizer.to(RegistryImage.named("gcr.io/my-project/my-image:tag")).withAdditionalTag("tag2");
* }</pre>
*
* @param tag the additional tag to push to
* @return this
*/
public IContainerizer WithAdditionalTag(string tag)
{
Preconditions.CheckArgument(ImageReference.IsValidTag(tag), "invalid tag '{0}'", tag);
additionalTags.Add(tag);
return(this);
}