Add windows build

.github/workflows/ci.yml

@@ -4,6 +4,7 @@ on: push
 env:
   RELEASE_FILES: |
     linux/*.so
+    windows/*.dll
 
 jobs:
   build_ubuntu:
@@ -23,6 +24,35 @@ jobs:
         with:
           name: linux
           path: build/*.so
+
+  build_windows:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: msys2/setup-msys2@v2
+        with:
+          msystem: MINGW64
+          update: true
+          install: >-
+            base-devel
+            git
+            make
+            mingw-w64-x86_64-cmake
+            mingw-w64-x86_64-ninja
+            mingw-w64-x86_64-toolchain
+      - name: Configure build
+        run: cmake -Bbuild -H.
+      - name: Build
+        run: cmake --build ./build
+      - name: Store artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: windows
+          path: build/*.dll
+
   release:
     if: ${{ github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v') }}
     needs: [build_ubuntu]