[CI] Get rid of includes in matrix (in gpu workflow)

It enforces adding extra Windows job, and the BMG runner on Windows is not enabled yet

Author: lukaszstolarczuk

.github/workflows/reusable_gpu.yml

@@ -42,21 +42,13 @@ jobs:
       CUDA_PATH: "C:/cuda"
       COVERAGE_NAME : "exports-coverage-${{inputs.provider}}-${{inputs.runner}}"
     # run only on upstream; forks will not have the HW
-    # also, disable Windows for L0-BMG, as such runner is not enabled yet
     if: github.repository == 'oneapi-src/unified-memory-framework'
     strategy:
       fail-fast: false
       matrix:
         shared_library: ${{ fromJSON(inputs.shared_lib)}}
         os: ${{ fromJSON(inputs.os)}}
         build_type: ${{ fromJSON(inputs.build_type)}}
-        include:
-          - os: 'Ubuntu'
-            compiler: {c: gcc, cxx: g++}
-            number_of_processors: '$(nproc)'
-          - os: 'Windows'
-            compiler: {c: cl, cxx: cl}
-            number_of_processors: '$Env:NUMBER_OF_PROCESSORS'
 
     runs-on: ["DSS-${{inputs.runner}}", "DSS-${{matrix.os}}"]
     steps:
@@ -90,8 +82,6 @@ jobs:
           -B ${{env.BUILD_DIR}}
           -DCMAKE_INSTALL_PREFIX="${{env.INSTL_DIR}}"
           -DCMAKE_BUILD_TYPE=${{matrix.build_type}}
-          -DCMAKE_C_COMPILER=${{matrix.compiler.c}}
-          -DCMAKE_CXX_COMPILER=${{matrix.compiler.cxx}}
           -DUMF_BUILD_SHARED_LIBRARY=${{matrix.shared_library}}
           -DUMF_BUILD_BENCHMARKS=ON
           -DUMF_BUILD_BENCHMARKS_MT=ON
@@ -108,7 +98,7 @@ jobs:
           ${{ matrix.os == 'Windows' && '-DCMAKE_SUPPRESS_REGENERATION=ON' || '' }}
 
       - name: Build UMF
-        run: cmake --build ${{env.BUILD_DIR}} --config ${{matrix.build_type}} -j ${{matrix.number_of_processors}}
+        run: cmake --build ${{env.BUILD_DIR}} --config ${{matrix.build_type}} -j12
 
       - name: Run tests
         working-directory: ${{env.BUILD_DIR}}