Added linux workflow

.github/workflows/linux.yml

@@ -0,0 +1,65 @@
+name: Linux
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches: [master]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.job }}-${{ github.ref }}
+  cancel-in-progress: true
+defaults:
+  run:
+    shell: bash -e -l {0}
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    name: ${{ matrix.sys.compiler }} ${{ matrix.sys.version }} - ${{ matrix.sys.blas }}
+    strategy:
+      fail-fast: false
+      matrix:
+        sys:
+        - { compiler: gcc, verion: '8', blas: OpenBLAS }
+        - { compiler: gcc, verion: '8', blas: mkl}
+        - { compiler: gcc, verion: '9', blas: OpenBLAS }
+        - { compiler: gcc, verion: '9', blas: mkl}
+        - { compiler: gcc, verion: '10', blas: OpenBLAS }
+        - { compiler: gcc, verion: '10', blas: mkl}
+        - { compiler: gcc, verion: '11', blas: OpenBLAS }
+        - { compiler: gcc, verion: '11', blas: mkl}
+
+    steps:
+
+    - name: Setup GCC
+      if: ${{ matrix.sys.compiler == 'gcc' }}
+      run: |
+        GCC_VERSION=${{ matrix.sys.version }}
+        sudo apt-get update
+        sudo apt-get --no-install-suggests --no-install-recommends install g++-$GCC_VERSION
+        CC=gcc-$GCC_VERSION
+        echo "CC=$CC" >> $GITHUB_ENV
+        CXX=g++-$GCC_VERSION
+        echo "CXX=$CXX" >> $GITHUB_ENV
+
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set conda environment
+      uses: mamba-org/setup-micromamba@main
+      with:
+        environment-name: myenv
+        environment-file: environment-dev.yml
+        init-shell: bash
+        cache-downloads: true
+        create-args: |
+          $ {{ (matrix.sys.blas == 'mkl' && 'mkl') || (matrix.sys.name == 'OpenBLAS' && 'openblas==0.3 blas-devel') }}
+
+    - name: Configure using CMake
+      run: cmake -Bbuild-DDOWNLOAD_GTEST=ON -DCMAKE_PREFIX_PATH=$CONDA_PREFIX -DCMAKE_C_COMPILER=$CC -DCMAKE_CXX_COMPILER=$CXX -DCMAKE_SYSTEM_IGNORE_PATH=/usr/lib
+
+    - name: Build
+      working-directory: build
+      run: cmake --build . --target test_xtensor_blas --parallel 8
+
+    - name: Run tests
+      working-directory: build/test
+      run: ./test_xtensor_blas