Add label to build #256

Job	Run time
gatekeeper	6s
load-config	5s
check-changes	13s
build-vllm-ec2-image	3m 9s
build-vllm-rayserve-image	2m 35s
build-vllm-sagemaker-image	23s
set-rayserve-test-environment	5s
vllm-rayserve-cuda-test	16s
vllm-rayserve-regression-test	18s
vllm-rayserve-example-test	16s
set-ec2-test-environment	3s
vllm-ec2-cuda-test	3m 16s
vllm-ec2-example-test	3m 9s
vllm-ec2-regression-test	16s
set-sagemaker-test-environment	6s
vllm-sagemaker-example-test	17s
vllm-sagemaker-regression-test	21s
vllm-sagemaker-cuda-test	21s
vllm-sagemaker-endpoint-test	7m 33s
	22m 48s

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