Add label to build #263

Job	Run time
gatekeeper	6s
load-config	5s
check-changes	14s
build-sglang-ec2-image	5m 32s
build-sglang-sagemaker-image	32s
set-ec2-test-environment	6s
sglang-ec2-upstream-test	1s
sglang-ec2-local-benchmark-test	9m 2s
set-sagemaker-test-environment	4s
sglang-sagemaker-local-benchmark-test	8m 52s
sglang-sagemaker-upstream-test	1s
sglang-sagemaker-endpoint-test	8m 27s
	33m 2s

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