First attempt at adding Intel LLVM to CI

.github/workflows/ci.yml

@@ -40,3 +40,33 @@ jobs:
       run: make -C build -j `nproc`
     - name: Test
       run: ./build/test/gtest/spblas-tests
+
+  intel-llvm:
+    runs-on: 'ubuntu-latest'
+    strategy:
+      matrix:
+        mkl: [OFF, ON]
+    name: intel-llvm${{ matrix.mkl == 'ON' && '-mkl' || '' }}
+    env:
+      CXX: icpx
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Intel
+      run: |
+          wget -O- https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS.PUB \
+          | gpg --dearmor | sudo tee /usr/share/keyrings/oneapi-archive-keyring.gpg > /dev/null
+          echo "deb [signed-by=/usr/share/keyrings/oneapi-archive-keyring.gpg] https://apt.repos.intel.com/oneapi all main" | sudo tee /etc/apt/sources.list.d/oneAPI.list
+          sudo apt-get update -y
+          sudo apt-get install -y intel-oneapi-compiler-dpcpp-cpp intel-oneapi-mkl-devel
+    - name: CMake
+      run: |
+        source /opt/intel/oneapi/setvars.sh
+        cmake -B build -DENABLE_ONEMKL=${{ matrix.mkl }}
+    - name: Build
+      run: |
+        source /opt/intel/oneapi/setvars.sh
+        make -C build -j `nproc`
+    - name: Test
+      run: |
+        source /opt/intel/oneapi/setvars.sh
+        ./build/test/gtest/spblas-tests