Add iOS build to CI #659

Job	Run time
iOS	10m 15s
linux (clang, clang++, Debug)	2m 30s
emscripten	1m 34s
android (ON)	52s
linux (clang, clang++, Release)	1m 19s
android (OFF)	2m 17s
Linux Backcompat	2m 31s
linux (gcc, g++, Debug)	7m 42s
linux-asan (gcc, g++, Debug, -fsanitize=address)	4m 53s
linux (gcc, g++, Release)	1m 49s
linux-asan (gcc, g++, Debug, -fsanitize=thread)	11m 53s
macos (macos-11, clang, clang++, Debug)	23m 53s
windows (windows-2019, windows, Debug)	6m 7s
macos (macos-11, clang, clang++, Release)	12m 9s
windows (windows-2019, windows, Release)	5m 51s
macos (macos-11, gcc, g++, Debug)	13m 9s
macos (macos-11, gcc, g++, Release)	12m 47s
macos (macos-12, clang, clang++, Debug)	13m 25s
macos (macos-12, clang, clang++, Release)	13m 51s
macos (macos-12, gcc, g++, Debug)	7m 36s
macos (macos-12, gcc, g++, Release)	11m 49s
	2h 48m 12s

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