run build-only e2e at build stage

Author: ayylol

.github/workflows/sycl-windows-build.yml

@@ -200,3 +200,38 @@ jobs:
         $exitCode = $LASTEXITCODE
         Remove-Item -Path "windows_detect_hung_tests.ps1"
         exit $exitCode
+    #############################################################################
+    - name: Setup SYCL toolchain
+      run: |
+        echo "PATH=$env:GITHUB_WORKSPACE\\install\\bin;$env:PATH" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+    - run: |
+        sycl-ls
+    - run: |
+        sycl-ls --verbose
+    - name: Configure E2E with Level Zero target
+      shell: cmd
+      run: |
+        mkdir build-e2e
+        cmake -GNinja -B build-e2e -S.\llvm\sycl\test-e2e -DSYCL_TEST_E2E_TARGETS="level_zero:gpu" -DCMAKE_CXX_COMPILER="clang++" -DLEVEL_ZERO_LIBS_DIR="D:\github\level-zero_win-sdk\lib" -DLEVEL_ZERO_INCLUDE="D:\github\level-zero_win-sdk\include" -DLLVM_LIT="..\llvm\llvm\utils\lit\lit.py"
+    - name: Run End-to-End tests
+      shell: bash
+      run: |
+        # Run E2E tests.
+        export LIT_OPTS="-v --no-progress-bar --show-unsupported --show-pass --show-xfail --max-time 3600 --time-tests --param test-mode=build-only"
+        cmake --build build-e2e --target check-sycl-e2e
+    - name:  Detect hung tests
+      if: always()
+      shell: powershell
+      run: |
+        Invoke-WebRequest -Uri "https://raw.githubusercontent.com/intel/llvm/refs/heads/sycl/devops/scripts/windows_detect_hung_tests.ps1" -OutFile "windows_detect_hung_tests.ps1"      
+        powershell.exe -File windows_detect_hung_tests.ps1
+        $exitCode = $LASTEXITCODE
+        Remove-Item -Path "windows_detect_hung_tests.ps1"
+        exit $exitCode
+    - name: Cleanup
+      shell: cmd
+      if: always()
+      run: |
+        rmdir /q /s install
+        rmdir /q /s build-e2e
+    #############################################################################