CI-unixish

added `ubuntu-24.04` to CI and made it the primary platform #509

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Run time

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Job	Run time
build (clang++, ubuntu-20.04)	43s
build (clang++, ubuntu-22.04)	1m 14s
build (clang++, ubuntu-24.04)	2m 11s
build (clang++, macos-13)	1s
build (clang++, macos-14)	1s
build (g++, ubuntu-20.04)	27s
build (g++, ubuntu-22.04)	1m 11s
build (g++, ubuntu-24.04)	1m 35s
build (g++, macos-13)	1s
build (g++, macos-14)	1s
	7m 25s