add workflow

.github/workflows/windows_nightly.yml

@@ -0,0 +1,37 @@
+name: "Windows Nightly Build"
+on:
+    schedule:
+        - cron: "0 0 * * *" # every day at midnight
+jobs:
+    build:
+        runs-on: windows-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+            - name: Set up Flutter
+              uses: subosito/flutter-action@v2
+              with:
+               channel: 'stable'
+            - run: flutter --version
+            - name: Set up Rust
+              uses: dtolnay/rust-toolchain@stable
+            - run: rustup --version  
+            - run: cargo --version
+            - name: Set up LLVM
+              uses: KyleMayes/install-llvm-action@v1
+              with:
+               version: "10.0"
+            - run: llvm-config --version
+            - name: Set up Flutter rust bridge
+              run: cargo install 'flutter_rust_bridge_codegen@^2.0.0-dev.0'
+            - name: Flutter pub get
+              run: flutter pub get  
+            - name: Rust bridge generate
+              run: flutter_rust_bridge_codegen generate
+            - name: Flutter build Windows
+              run: flutter build windows
+            - name: Archive build
+              uses: actions/upload-artifact@v4
+              with:
+                name: windows
+                path: build/windows/x64/runner/Release