CI: Add Ubuntu on ARM runner to CI #740

Job	Run time
ubuntu (gcc with CUDA, both)	53m 38s
ubuntu (gcc without CUDA, both)	50m 26s
ubuntu (clang with CUDA, both)	54m 24s
ubuntu (clang without CUDA, both)	48m 42s
ubuntu (gcc with CUDA, static)	48m 24s
msvc (cl with OpenMP without CUDA, both)	36m 54s
msvc (cl without OpenMP without CUDA, both)	23m 47s
msvc (cl with OpenMP with CUDA, both)	1h 0m 34s
msvc (cl with OpenMP with CUDA, static)	53m 30s
msvc (clang-cl with OpenMP without CUDA, both)	15m 50s
msvc (clang with OpenMP without CUDA, both)	15m 47s
	7h 41m 56s

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