refactor workflows #165

Job	Run time
gatekeeper	5s
check-changes	19s
build-vllm-rayserve-image	12s
build-vllm-ec2-image	16s
build-vllm-sagemaker-image	16s
set-rayserve-test-environment	6s
vllm-rayserve-regression-test	4m 4s
vllm-rayserve-cuda-test	1m 22s
vllm-rayserve-example-test	17m 11s
set-ec2-test-environment	3s
set-sagemaker-test-environment	4s
vllm-ec2-cuda-test	1m 56s
vllm-ec2-example-test	24m 9s
vllm-ec2-regression-test	3m 26s
vllm-sagemaker-cuda-test	1m 52s
vllm-sagemaker-example-test	33m 20s
vllm-sagemaker-regression-test	3m 59s
vllm-sagemaker-endpoint-test	7m 57s
	1h 40m 37s

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