add xcodebuild env var name #984

Job	Run time
Clean up previous branch jobs	9s
Unit Tests	5s
Package builder app	9s
aws-c-cal (manylinux1-x86)	14s
compilers (clang-9)	6s
aws-c-cal (manylinux1-x64)	16s
compilers (clang-10)	3s
aws-c-cal (manylinux2014-x86)	13s
compilers (clang-11)	4s
compilers (gcc-7)	3s
aws-c-cal (manylinux2014-x64)	16s
compilers (gcc-8)	7s
aws-c-cal (manylinux2014-aarch64)	17s
compilers (gcc-9)	7s
aws-c-cal (musllinux-1-1-aarch64)	8s
cross_compile (linux-armv6)	3s
compilers (gcc-10)	7s
aws-c-cal (musllinux-1-1-x64)	10s
cross_compile (linux-armv7)	4s
downstream (aws-c-mqtt)	5s
compilers (gcc-11)	3s
cross_compile (linux-armv8)	2s
downstream (aws-c-http)	9s
downstream (aws-crt-python)	5s
release_notes (aws-crt-python)	2s
downstream (aws-crt-cpp)	3s
Sanity Test (ubuntu-22.04)	9s
release_notes (aws-iot-device-sdk-python-v2)	4s
swift (swift-5-ubuntu-x64)	11s
downstream (aws-crt-java)	8s
Sanity Test (macos-13)	8s
downstream (aws-crt-nodejs)	9s
swift (swift-5-centos-x64)	8s
Sanity Test (macos-14)	7s
swift (swift-5-al2-x64)	13s
Sanity Test (windows-2022)	47s
std-compat	0s
All Sanity Tests passed	0s
	5m 14s

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