feat: add github action to build windows apk

Author: ekyaaa

.github/workflows/build-windows.yaml

@@ -0,0 +1,33 @@
+name: Build Flutter Windows App
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build-windows:
+    runs-on: windows-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: 'stable'
+
+      - name: Enable Windows Desktop
+        run: flutter config --enable-windows-desktop
+
+      - name: Install dependencies
+        run: flutter pub get
+
+      - name: Build Windows app
+        run: flutter build windows
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: windows-build
+          path: build/windows/x64/runner/Release/