Add msys2 test

Author: kintel

.github/workflows/actions_cpp.yml

@@ -22,6 +22,30 @@ jobs:
       run: |
         cd CPP/build
         ctest . -C RelWithDebInfo --output-on-failure
+  windows-msys2:
+    runs-on: 'windows-latest'
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+    - uses: actions/checkout@v4
+    - uses: msys2/setup-msys2@v2
+      with:
+        msystem: UCRT64
+        update: true
+        pacman: >-
+          mingw-w64-ucrt-x86_64-toolchain
+          mingw-w64-ucrt-x86_64-cmake
+    - name: Build
+      run: |
+        mkdir CPP/build
+        cd CPP/build
+        cmake .. -G "MSYS Makefiles" -DCLIPPER2_TESTS=ON
+        cmake --build . --parallel
+    - name: Run tests
+      run: |
+        cd CPP/build
+        ctest . --output-on-failure
   ubuntu-latest-gcc-default:
     runs-on: 'ubuntu-latest'
     steps: