CI: add tests for various MSYS2 environments #172

Job	Run time
makefile-analysis	1m 7s
makefile-alpine-amd64-gcc	12s
cmake-alpine-amd64-gcc	12s
cmake-alpine-armv7-gcc	59s
makefile-alpine-armv7-gcc	58s
cmake-alpine-armv7-clang	1m 38s
makefile-ubuntu-20.04-amd64-gcc	4s
cmake-ubuntu-20.04-x86_64	13s
makefile-alpine-armv7-clang	1m 42s
cmake-alpine-aarch64-gcc	1m 26s
cmake-ubuntu-20.04-i686	37s
makefile-ubuntu-20.04-amd64-gcc +openmp	10s
cmake-macos-11-x86_64	19s
cmake-alpine-aarch64-clang	1m 41s
makefile-ubuntu-20.04-amd64-clang	13s
makefile-alpine-aarch64-gcc	1m 25s
cmake-windows-2019-x86_64	31s
cmake-alpine-s390x-gcc	1m 36s
makefile-ubuntu-20.04-amd64-clang +openmp	11s
makefile-alpine-aarch64-clang	1m 25s
cmake-windows-2019-i686	55s
cmake-alpine-s390x-clang	1m 43s
makefile-macos-11-amd64-clang	14s
makefile-alpine-s390x-gcc	1m 31s
cmake-alpine-ppc64le-gcc	1m 5s
makefile-alpine-s390x-clang	1m 42s
cmake-alpine-ppc64le-clang	1m 40s
makefile-alpine-ppc64le-gcc	54s
msys2-cmake-msys	1m 31s
makefile-alpine-ppc64le-clang	1m 32s
msys2-makefile-msys	1m 12s
msys2-cmake-mingw64	1m 57s
msys2-makefile-mingw64	1m 59s
msys2-makefile-ucrt64	1m 54s
msys2-cmake-ucrt64	1m 59s
msys2-cmake-clang32	2m 9s
msys2-cmake-clang64	2m 1s
	42m 37s

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