ci: add Gitea Action Windows build release

.gitea/workflows/build.yaml

@@ -0,0 +1,52 @@
+name: Build and Release Windows Client
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install LLVM
+        run: choco install llvm --no-progress
+
+      - name: Build Client
+        working-directory: ./client
+        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/release/meshvpn-client.exe
+            meshvpn-client.msi
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}