First CI workflow.

.github/workflows/cmake-cuda-multi-compiler.yml

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+# This starter workflow is for a CMake project running on multiple platforms. There is a different starter workflow if you just want a single platform.
+# See: https://github.com/actions/starter-workflows/blob/main/ci/cmake-single-platform.yml
+name: CUDA Build with multiple compilers
+
+on:
+  push:
+    branches: [ "kmm-integration" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+
+      matrix:
+        os: [ubuntu-latest]
+        build_type: [Debug]
+        cpp_compiler: [g++, clang++]
+
+    steps:
+      - uses: Jimver/[email protected]
+        id: cuda-toolkit
+        with:
+          method: 'network'
+          sub-packages: '["toolkit"]'
+      - uses: actions/checkout@v4
+        with:
+          submodules: 'recursive'
+
+      - name: Set reusable strings
+        # Turn repeated input strings (such as the build output directory) into step outputs. These step outputs can be used throughout the workflow file.
+        id: strings
+        shell: bash
+        run: |
+          echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
+
+      - name: Configure CMake
+        # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
+        # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
+        run: >
+          cmake -B ${{ steps.strings.outputs.build-output-dir }}
+          -DCMAKE_CXX_COMPILER=${{ matrix.cpp_compiler }}
+          -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
+          -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON
+          -DSPDLOG_FMT_EXTERNAL:BOOL=ON
+          -S ${{ github.workspace }}
+
+      - name: Build
+        # Build your program with the given configuration. Note that --config is needed because the default Windows generator is a multi-config generator (Visual Studio generator).
+        run: cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }}