ci: add windows and macos build

.github/workflows/main.yml

@@ -26,3 +26,43 @@ jobs:
         bundler-cache: true
     - name: Run the default task
       run: bundle exec rake
+  build-win:
+    runs-on: windows-latest
+    name: Ruby 3.2 (Windows)
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install gfortran
+        run: choco install -y mingw
+      - name: Set up Ruby 3.2
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.2
+          bundler-cache: true
+      - name: Build
+        run: bundle exec rake compile
+      - name: Cache OpenBLAS
+        uses: actions/cache@v3
+        with:
+          path: vendor
+          key: win-vendor-${{ hashFiles('ext/numo/tiny_linalg/extconf.rb') }}
+      - name: Run test
+        run: bundle exec rake test
+  build-mac:
+    runs-on: macos-latest
+    name: Ruby 3.2 (macOS)
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Ruby 3.2
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.2
+          bundler-cache: true
+      - name: Build
+        run: bundle exec rake compile
+      - name: Cache OpenBLAS
+        uses: actions/cache@v3
+        with:
+          path: vendor
+          key: mac-vendor-${{ hashFiles('ext/numo/tiny_linalg/extconf.rb') }}
+      - name: Run test
+        run: bundle exec rake test