Optional<ImageReference> getImageReference() {
    return Optional.ofNullable(imageReference);
  }
Sets the name of the image. This is the name that shows up when the tar is loaded by the Docker
daemon.

@param imageReference the image reference
@return this
@throws InvalidImageReferenceException if {@code imageReference} is not a valid image reference
jib-core/src/main/java/com/google/cloud/tools/jib/api/TarImage.java