Update CI config

.github/workflows/linux.yml

@@ -0,0 +1,34 @@
+on: [push]
+
+env:
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    runs-on: ${{matrix.os}}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, macos-10.15, windows-2019]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Create Build Environment
+      run: cmake -E make_directory ${{runner.workspace}}/build
+
+    - name: Configure CMake
+      # Use a bash shell so we can use the same syntax for environment variable
+      # access regardless of the host operating system
+      shell: bash
+      working-directory: ${{runner.workspace}}/build
+      run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+
+    - name: Build
+      working-directory: ${{runner.workspace}}/build
+      shell: bash
+      run: cmake --build . --config $BUILD_TYPE
+
+    - name: Test
+      working-directory: ${{runner.workspace}}/build
+      shell: bash
+      run: ctest -C $BUILD_TYPE