build

CI: export SDKROOT for macos runner #684

Job	Run time
ci (Release, DP, linux gnu-10)	41m 45s
ci (Release, DP, linux gnu-14)	41m 32s
ci (Release, DP, linux nvhpc-21.9)	33m 13s
ci (Release, DP, linux intel-classic)	12m 22s
ci (Release, DP, macos)	42m 28s
ci (Release, SP, linux gnu-10)	43m 2s
ci (Release, SP, linux gnu-14)	43m 12s
ci (Release, SP, linux nvhpc-21.9)	33m 11s
ci (Release, SP, linux intel-classic)	13m 41s
ci (Release, SP, macos)	40m 30s
	5h 44m 56s

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