Build private & public subnet in every AZ #591

Job	Run time
build-image	8m 7s
build-image-neuron-inference	4m 38s
build	2m 50s
build-image-neuronx	14m 15s
build-image-neuron-training	6m 46s
build-image-nvidia-inference	5h 17m 5s
build-image-nvidia-training	5h 1m 23s
build-image-nvidia	4m 52s
build-test	1m 17s
	11h 1m 13s

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