MSYS2

ci: add workflow to build on Alpine, too #10

	name: MSYS2

	on: push

	jobs:
	msys2_mingw64:
	runs-on: windows-2022
	defaults:
	run:
	shell: msys2 {0}
	steps:
	# Checks-out the repository under $GITHUB_WORKSPACE.
	- uses: actions/checkout@v4
	with:
	submodules: 'recursive'
	- uses: msys2/setup-msys2@v2
	with:
	msystem: mingw64
	update: true
	install: >-
	mingw-w64-x86_64-cmake
	mingw-w64-x86_64-gcc
	mingw-w64-x86_64-make
	mingw-w64-x86_64-ninja
	- name: Build
	run: \|
	export MSYSTEM=MINGW64
	export CXX=g++
	export CC=gcc
	cd $GITHUB_WORKSPACE
	mkdir build
	cd build
	cmake ../
	cmake --build . -j2
	- name: Run tests
	run: \|
	export MSYSTEM=MINGW64
	cd "$GITHUB_WORKSPACE/build"
	ctest -V
	- name: Build statically linked
	run: \|
	export MSYSTEM=MINGW64
	export CXX=g++
	export CC=gcc
	cd $GITHUB_WORKSPACE
	mkdir build-static
	cd build-static
	cmake -DENABLE_LTO=ON -DENABLE_STATIC_LINKING=ON ../
	cmake --build . -j2

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