ARM Linux CI (#2244) #1695

Job	Run time
Ubuntu ARM (x5)	12m 13s
Ubuntu GCC with NTL (assert, x2)	8m 20s
Ubuntu GCC, Code Coverage (x10)	29m 22s
Alpine Linux, musl, 32-bit (assert, x1.5)	14m 9s
GCC build regression check (no tests)	1m 12s
macOS-M1, Clang (x3)	17m 27s
MinGW GCC (x0.5)	10m 47s
MSVC (x1)	24m 22s
Nemo.jl	18m 21s
Ubuntu Clang, BLAS and examples (x5)	13m 55s
	2h 30m 8s

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