def createReferenceArtifact(queue, taskid, runid, name, url, expires,
    content_type):
    """Creates a Taskcluster reference artifact for the given taskid/runid"""
    queue.createArtifact(taskid, runid, name, {'storageType': 'reference',
        'contentType': content_type, 'expires': expires, 'url': url})
