ci: fix rust and wix pathing in windows runner

.gitea/workflows/build.yaml

@@ -16,11 +16,13 @@ jobs:
       - name: Install Rust
         shell: pwsh
         run: |
-          # Install rustup using the official Windows installer
+          $installDir = "$env:USERPROFILE\.cargo\bin"
+          if (-not (Test-Path $installDir)) {
             Invoke-WebRequest -Uri "https://static.rust-lang.org/rustup/dist/x86_64-pc-windows-msvc/rustup-init.exe" -OutFile "rustup-init.exe"
             .\rustup-init.exe -y --default-toolchain stable
-          # Add cargo to PATH for the rest of the session
+          }
-          echo "$HOME\.cargo\bin" | Out-File -FilePath $env:GITHUB_PATH -Append -Encoding utf8
+          # Append to GITHUB_PATH for subsequent steps
+          Add-Content -Path $env:GITHUB_PATH -Value $installDir
 
       - name: Install LLVM
         run: choco install llvm --no-progress
@@ -28,6 +30,8 @@ jobs:
       - name: Build Client
         shell: pwsh
         run: |
+          # Manually ensure cargo is in path for this specific shell session
+          $env:Path = "$env:USERPROFILE\.cargo\bin;" + $env:Path
           cd client
           cargo build --release
 
@@ -36,7 +40,6 @@ jobs:
         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
@@ -45,8 +48,8 @@ jobs:
       - name: Build MSI Installer
         shell: pwsh
         run: |
-          # candle.exe compiles .wxs to .wixobj
+          # Add WiX bin to path (common choco install path)
-          # light.exe links .wixobj to .msi
+          $env:Path += ";C:\Program Files (x86)\WiX Toolset v3\bin"
           candle.exe installer\product.wxs -o installer\product.wixobj
           light.exe installer\product.wixobj -o meshvpn-client.msi