build

Add default compiler flags for Cray #743

Job	Run time
ci (Release, DP, linux gnu-10)	46m 35s
ci (Release, DP, linux gnu-14)	46m 20s
ci (Release, DP, linux nvhpc-23.5)	48m 32s
ci (Release, DP, linux intel-classic)	22m 1s
ci (Release, DP, macos)	49m 3s
ci (Release, SP, linux gnu-10)	47m 47s
ci (Release, SP, linux gnu-14)	47m 47s
ci (Release, SP, linux nvhpc-23.5)	47m 22s
ci (Release, SP, linux intel-classic)	23m 11s
ci (Release, SP, macos)	44m 0s
	7h 2m 38s

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