@Override
  public String getActionDescription() {
    return "push image manifest for "
        + registryEndpointRequestProperties.getServerUrl()
        + "/"
        + registryEndpointRequestProperties.getImageName()
        + ":"
        + imageTag;
  }
Makes the warning for when the registry responds with an image digest that is not the expected
digest of the image.

@param expectedDigest the expected image digest
@param receivedDigests the received image digests
@return the warning message
jib-core/src/main/java/com/google/cloud/tools/jib/registry/ManifestPusher.java