Create windows.yml

.github/workflows/windows.yml

@@ -0,0 +1,23 @@
+name: Windows build
+on:
+  push:
+    branches: [master]
+jobs:
+  windows:
+    runs-on: windows-latest
+    steps:
+      - name: Check Out
+        uses: actions/checkout@v3
+      - name: Setup flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+      - name: Build
+        run: flutter build windows --release
+      - name: Package files
+        run: cd build/windows/runner/Release && 7z a -mx9 -y ../../../../windows.7z
+      - name: Upload files
+        uses: actions/upload-artifact@v3
+        with:
+          name: windows
+          path: ./windows.7z