Simplify get_docker_image.py  (#12166)
Simplify get_docker_image.py  (#12166)

Simplify get_docker_image.py by leverage docker itself remote cache functionality.
microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime