Add Clang 20 image for Ubuntu Noble #224

Job	Run time
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 16)	2m 35s
build (linux/amd64, ubuntu-24.04, noble, clang, 18)	2m 50s
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 18)	2m 55s
build (linux/amd64, ubuntu-24.04, noble, clang, 16)	2m 33s
build (linux/amd64, ubuntu-24.04, noble, gcc, 13)	2m 31s
build (linux/amd64, ubuntu-24.04, noble, gcc, 14)	2m 35s
build (linux/amd64, ubuntu-24.04, noble, clang, 19)	2m 38s
build (linux/amd64, ubuntu-24.04, noble, clang, 20)	2m 33s
build (linux/amd64, ubuntu-24.04, noble, clang, 17)	2m 31s
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 17)	2m 44s
build (linux/amd64, ubuntu-24.04, jammy, gcc, 12)	2m 26s
build (linux/arm64, ubuntu-24.04-arm, jammy, gcc, 12)	2m 32s
build (linux/arm64, ubuntu-24.04-arm, noble, gcc, 14)	2m 33s
build (linux/arm64, ubuntu-24.04-arm, noble, gcc, 13)	2m 44s
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 20)	2m 38s
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 19)	2m 45s
merge	0s
	42m 3s

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