Add Stale GitHub Action #415

Job	Run time
Publish Image (pytorch-dist-sendrecv-test, examples/pytorch/smoke-dist/Dockerfile) / Publish Image	1m 55s
Publish Image (pytorch-elastic-example-echo, examples/pytorch/elastic/echo/Dockerfile) / Publish Image	9m 50s
Publish Image (pytorch-elastic-example-imagenet, examples/pytorch/elastic/imagenet/Dockerfile) / Publish Image	7m 45s
Publish Image (tf-dist-mnist-test, examples/tensorflow/dist-mnist/Dockerfile) / Publish Image	1m 39s
Publish Image (tf-distributed-worker, examples/tensorflow/distribution_strategy/estimator-API/Doc... / Publish Image	32s
Publish Image (tf-mnist-with-summaries, examples/tensorflow/mnist_with_summaries/Dockerfile) / Publish Image	46s
Publish Image (tf-multi-worker-strategy, examples/tensorflow/distribution_strategy/keras-API/Dock... / Publish Image	4m 49s
Publish Image (tf-smoke, examples/tensorflow/tf_sample/Dockerfile) / Publish Image	58s
	28m 14s

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