ci: add x86_64 macOS cross-compilation build to GitHub Actions #244

Job	Run time
Build container / Build container	21s
arm-linux-gnueabihf / Build depends	14m 46s
x86_64-pc-linux-gnu_multiprocess / Build depends	17m 33s
x86_64-pc-linux-gnu_nowallet / Build depends	12m 31s
x86_64-pc-linux-gnu / Build depends	13m 25s
x86_64-apple-darwin / Build depends	15m 21s
x86_64-w64-mingw32 / Build depends	18m 32s
linux64_nowallet-build / Build source	14m 17s
linux64_cxx20-build / Build source	13m 19s
linux64_fuzz-build / Build source	13m 20s
linux64_sqlite-build / Build source	13m 21s
linux64-build / Build source	13m 22s
linux64_ubsan-build / Build source	13m 21s
arm-linux-build / Build source	11m 58s
mac-build / Build source	1m 28s
linux64_tsan-build / Build source	9m 12s
linux64_multiprocess-build / Build source	9m 10s
win64-build / Build source	8m 12s
	3h 33m 29s

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