gh workflow: test the build matrix

.github/workflows/matrix-test.yml

@@ -0,0 +1,85 @@
+name: "Matrix-Test"
+
+on:
+  push:
+    branches: [master, main]
+  pull_request:
+    branches: [master, main]
+
+jobs:
+  ix-build:
+    name: "${{ matrix.os }} ix-build"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest] # , macos-latest]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: 'Determine number of cores to build on (Linux)'
+        if: runner.os == 'Linux'
+        run: echo NPROC="$(nproc)" >> $GITHUB_ENV
+
+      - name: 'Determine number of cores to build on (macOS)'
+        if: runner.os == 'macOS'
+        run: echo NPROC="$(sysctl -n hw.logicalcpu)" >> $GITHUB_ENV
+
+      - name: 'Check shell environment'
+        run: |
+          echo "NPROC=$NPROC"
+          echo "SHELL=$SHELL"
+          echo "BASH_VERSION=$BASH_VERSION"
+          $SHELL --version
+
+  msys2-build:
+    needs: ix-build
+
+    name: '${{ matrix.os }} ${{ matrix.sys }} msys2-build'
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest]
+        sys: [mingw32, mingw64, ucrt64, clang64]
+        include:
+          - sys: mingw32
+            env: i686
+          - sys: mingw64
+            env: x86_64
+          - sys: ucrt64
+            env: ucrt-x86_64
+          - sys: clang64
+            env: clang-x86_64
+
+    defaults:
+      run:
+        shell: 'msys2 {0}'
+
+    steps:
+      - name: 'git config core.autocrlf (Windows)'
+        run: git config --global core.autocrlf input
+        shell: bash
+
+      - uses: actions/checkout@v3
+
+      - name: 'Set MINGW_ARCH (Windows)'
+        shell: bash
+        run: echo MINGW_ARCH="${{ matrix.sys }}" >> $GITHUB_ENV
+
+      - name: 'Set up MSYS2 and Install Software'
+        uses: msys2/setup-msys2@v2
+        with:
+          msystem: ${{ matrix.sys }}
+
+      - name: 'Determine number of cores to build on (Windows)'
+        run: echo NPROC="${NUMBER_OF_PROCESSORS-unknown}" >> $GITHUB_ENV
+
+      - name: 'Check shell environment'
+        run: |
+          echo "NPROC=$NPROC"
+          echo "SHELL=$SHELL"
+          echo "BASH_VERSION=$BASH_VERSION"
+          $SHELL --version