Init action

action.yml

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+name: 'build libcloudph++'
+description: 'builds libcloudph++, libcloudph++ code needs to be check out before running this action'
+inputs:
+  disable_cuda:
+    description: 'disable CUDA build?'
+    required: true
+    default: false
+  build_type:
+    description: 'CMake build type: Release, Debug, ...'
+    required: true
+    default: "Release"
+  threads:
+    description: "number of threads used by make"
+    required: true
+    default: 1
+
+runs:
+  using: "composite"
+  steps:
+  - name: Install Nvidia driver
+    if: ${{!inputs.disable_cuda}}
+    run: sudo apt install --no-install-recommends nvidia-driver-470
+
+  - name: Install Singularity
+    #when installed from this action, .SIF is always converted to sandbox (could be related to: https://githubmemory.com/repo/hpcng/singularity/issues/6065)
+    uses: eWaterCycle/setup-singularity@v6
+    with:
+      singularity-version: 3.7.1
+    #apt installation following https://sylabs.io/guides/3.0/user-guide/installation.html, but this is a too old version and uninstalls python-is-python3
+#    run: |
+#      wget -O- http://neuro.debian.net/lists/focal.de-fzj.libre | sudo tee /etc/apt/sources.list.d/neurodebian.sources.list
+#      sudo apt-key adv --recv-keys --keyserver hkps://keyserver.ubuntu.com 0xA5D32F012649A5A9
+#      sudo apt-get update
+#      sudo apt-get install -y singularity-container
+
+  - name: Cache UWLCM Singularity image
+    id: cache_singularity
+    uses: actions/cache@v2
+    with:
+      path: '${{ github.workspace }}/singularity_images/uwlcm_ubuntu_20_04_cuda_11_4.sif'
+      key: 'sng_ubuntu_20_04_cuda_11_4'
+
+  - name: Download UWLCM Singularity image
+    if: steps.cache_singularity.outputs.cache-hit != 'true'
+    run: |
+      mkdir '${{ github.workspace }}/singularity_images'
+      singularity pull --disable-cache --dir '${{ github.workspace }}/singularity_images' library://pdziekan/default/uwlcm:ubuntu_20_04_cuda_11_4
+    # disable Singularity cache, we cache manually
+
+  - name: Set friendly Singularity image name
+    uses: allenevans/set-env@v2.0.0
+    with:
+      SI: '${{ github.workspace }}/singularity_images/uwlcm_ubuntu_20_04_cuda_11_4.sif'
+
+  - 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: singularity exec $SI cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{inputs.build_type}} -DLIBCLOUDPHXX_FORCE_MULTI_CUDA=True -DLIBCLOUDPHXX_DISABLE_CUDA=${{inputs.disable_cuda}}
+#
+  - name: Build libcloudph++
+    # Build your program with the given configuration
+    run: VERBOSE=1 singularity exec $SI cmake --build ${{github.workspace}}/build --config ${{inputs.build_type}} -j${{inputs.threads}}