ci: restore windows-native build for EXE and MSI

.gitea/workflows/build.yaml

@@ -1,4 +1,4 @@
-name: Build and Release Windows Client (Linux Cross-Compile)
+name: Build and Release Windows Client
 
 on:
   push:
@@ -7,7 +7,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: windows-latest
 
     steps:
       - name: Checkout code
@@ -15,20 +15,38 @@ jobs:
 
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable
-        with:
-          targets: x86_64-pc-windows-msvc
 
-      - name: Install Mingw-w64 for linking
+      - name: Install LLVM
-        run: sudo apt-get update && sudo apt-get install -y mingw-w64
+        run: choco install llvm --no-progress
 
-      - name: Build Client (Cross-Compile)
+      - name: Build Client
         working-directory: ./client
-        run: cargo build --release --target x86_64-pc-windows-msvc
+        run: cargo build --release
+
+      - name: Prepare Binaries for Installer
+        shell: pwsh
+        run: |
+          New-Item -ItemType Directory -Force -Path bin
+          Copy-Item "client/target/release/meshvpn-client.exe" "bin/client.exe"
+          # Download Wintun.dll as it is a driver binary not stored in git
+          Invoke-WebRequest -Uri "https://github.com/WireGuard/wintun/releases/latest/download/wintun.dll" -OutFile "bin/wintun.dll"
+
+      - name: Install WiX Toolset
+        run: choco install wixtoolset --no-progress
+
+      - name: Build MSI Installer
+        shell: pwsh
+        run: |
+          # candle.exe compiles .wxs to .wixobj
+          # light.exe links .wixobj to .msi
+          candle.exe installer/product.wxs -o installer/product.wixobj
+          light.exe installer/product.wixobj -o meshvpn-client.msi
 
       - name: Create Gitea Release
         uses: softprops/action-gh-release@v1
         with:
           files: |
-            client/target/x86_64-pc-windows-msvc/release/meshvpn-client.exe
+            client/target/release/meshvpn-client.exe
+            meshvpn-client.msi
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}