build

Add default compiler flags for Cray #747

Job	Run time
ci (Release, DP, linux gnu-10)	37m 6s
ci (Release, DP, linux gnu-14)	36m 3s
ci (Release, DP, linux nvhpc-23.5)	39m 35s
ci (Release, DP, linux intel-classic)	16m 58s
ci (Release, DP, macos)	39m 10s
ci (Release, SP, linux gnu-10)	35m 46s
ci (Release, SP, linux gnu-14)	35m 25s
ci (Release, SP, linux nvhpc-23.5)	37m 58s
ci (Release, SP, linux intel-classic)	16m 9s
ci (Release, SP, macos)	33m 44s
	5h 27m 54s

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