@Override
                public void onNext(PullResponseItem item) {
                    super.onNext(item);
                    WorkflowLogger.continueActivity(pullActivity);
                }
DockerClientImpl is docker client to docker daemon to perform all
image actions like pull image, tag image, push image etc.
It connects to the docker daemon through an environment
variable @see ImageBuilderConfig.getDockerHost() or through to
the default host based on the operating system.
image-builder/builder-services/src/main/java/io/hyscale/builder/services/docker/impl/DockerRESTClient.java