CI-unixish

added `ubuntu-24.04` to CI and made it the primary platform #511

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Run time

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Job	Run time
build (clang++, ubuntu-20.04)	28s
build (clang++, ubuntu-22.04)	28s
build (clang++, ubuntu-24.04)	3m 11s
build (clang++, macos-13)	1m 7s
build (clang++, macos-14)	28s
build (g++, ubuntu-20.04)	24s
build (g++, ubuntu-22.04)	38s
build (g++, ubuntu-24.04)	1m 45s
build (g++, macos-13)	53s
build (g++, macos-14)	31s
	9m 53s