add workflow

.github/workflows/main.yml

@@ -0,0 +1,33 @@
+name: "Build Windows EXE"
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build-windows:
+    runs-on: "windows-latest"
+
+    steps:
+      - name: "Checkout repository"
+        uses: "actions/checkout@v4"
+
+      - name: "Set up Flutter"
+        uses: "subosito/flutter-action@v2"
+
+      - name: "Set up Rust"
+        uses: "dtolnay/rust-toolchain@stable"
+        with:
+          targets: "x86_64-pc-windows-msvc"
+
+      - name: "Install Flutter dependencies"
+        run: "flutter pub get"
+
+      - name: "Build Windows EXE"
+        run: |
+          flutter build windows --release
+
+      - name: "Upload Windows build"
+        uses: "actions/upload-artifact@v4"
+        with:
+          name: "windows-exe"
+          path: "build/windows/x64/runner/Release/"