Add Windows library building to Github Action.

.github/workflows/main.yml

@@ -22,19 +22,34 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        os:
-          - macos-latest
-          - ubuntu-latest
+        os: [macos-latest, ubuntu-latest, windows-latest]
+        include:
+          - { os: macos-latest,   shell: bash  }
+          - { os: ubuntu-latest,  shell: bash  }
+          - { os: windows-latest, shell: msys2, sys: mingw64 }
+    defaults:
+      run:
+        shell: ${{ matrix.shell }} {0}
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+
+      - name: Setup MSYS2
+        if: runner.os == 'Windows'
+        uses: msys2/setup-msys2@v2
+        with:
+          msystem: ${{ matrix.sys }}
+          install: git zip
+          pacboy: gcc:p
+
       - name: Build
         run: |
           ./batch.sh
           export platform=$(echo ${{ runner.os }} | awk '{print tolower($0)}')
           zip -r "libs-${platform}-x64.zip" dist
+
       - name: Release
         uses: softprops/action-gh-release@v2
         with: