Added OSX workflow

Author: JohanMabille

.github/workflows/osx.yml

@@ -0,0 +1,68 @@
+name: OSX
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches: [master]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.job }}-${{ github.ref }}
+  cancel-in-progress: true
+defaults:
+  run:
+    shell: bash -e -l {0}
+jobs:
+  build:
+    runs-on: macos-${{ matrix.os }}
+    name: macos-${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+        - 11
+        - 12
+
+    steps:
+
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set conda environment
+      uses: mamba-org/setup-micromamba@v1
+      with:
+        environment-file: environment-dev.yml
+        cache-environment: true
+
+    - name: Configure using CMake
+      run: cmake -Bbuild -DDOWNLOAD_GTEST=ON -DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX -DCMAKE_C_COMPILER=$CC -DCMAKE_CXX_COMPILER=$CXX $(Build.SourcesDirectory)
+
+    - name: Install
+      working-directory: build
+      run: cmake --install .
+
+    - name: Build
+      working-directory: build
+      run: cmake --build . --target test_xtensor_r --parallel 8
+
+    - name: Install R package
+      working-directory: build
+      env:
+        GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        echo "which tar"
+        which tar
+        export TAR="/usr/bin/tar"
+        R -e "library(devtools); install_github('xtensor-stack/Xtensor.R', configure.args = '--novendor')"
+
+    - name: Run tests (C++)
+      working-directory: build/test
+      run: ./test_xtensor_r
+
+    - name: Run tests (R)
+      working-directory: test
+      run: |
+        mkdir ~/.R
+        touch ~/.R/Makevars
+        echo "CXX14=$CXX" >> ~/.R/Makevars
+        echo "CXX14FLAGS=-fPIC -O2" >> ~/.R/Makevars
+        Rscript ./unittest.R
+