[GSoC] Provide a PyTorch MNIST Example for Push-based Metrics Collection #2111

Job	Run time
Publish Image (file-metrics-collector, cmd/metricscollector/v1beta1/file-metricscollector/Dockerf... / Publish Image	5m 58s
Publish Image (katib-controller, cmd/katib-controller/v1beta1/Dockerfile) / Publish Image	18m 4s
Publish Image (katib-db-manager, cmd/db-manager/v1beta1/Dockerfile) / Publish Image	4m 52s
Publish Image (katib-ui, cmd/ui/v1beta1/Dockerfile) / Publish Image	54s
Publish Image (tfevent-metrics-collector, cmd/metricscollector/v1beta1/tfevent-metricscollector/D... / Publish Image	6m 42s
	36m 30s

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