build

Add default compiler flags for Cray #746

Job	Run time
ci (Release, DP, linux gnu-10)	40m 10s
ci (Release, DP, linux gnu-14)	40m 0s
ci (Release, DP, linux nvhpc-23.5)	47m 30s
ci (Release, DP, linux intel-classic)	21m 38s
ci (Release, DP, macos)	40m 16s
ci (Release, SP, linux gnu-10)	39m 11s
ci (Release, SP, linux gnu-14)	39m 18s
ci (Release, SP, linux nvhpc-23.5)	47m 25s
ci (Release, SP, linux intel-classic)	20m 47s
ci (Release, SP, macos)	37m 16s
	6h 13m 31s

Provide feedback