@Override
  public URL getApiRoute(String apiRouteBase) throws MalformedURLException {
    return new URL(
        apiRouteBase + registryEndpointRequestProperties.getImageName() + "/manifests/" + 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