Add GitHub workflow for CMake build

PiperOrigin-RevId: 346521211
Change-Id: Idf60be85aa3983ad625bcef53b48e8d0b797ed4a

sandboxed_api/.github/workflows/ubuntu-cmake.yml

@@ -0,0 +1,40 @@
+name: CMake
+
+on: [push, pull_request]
+
+env:
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, ubuntu-18.04]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Install ninja-build tool
+      uses: seanmiddleditch/gha-setup-ninja@v3
+
+    - name: Create Build Environment
+      run: |
+        pip3 install absl-py clang
+        cmake -E make_directory ${{runner.workspace}}/build
+
+    - name: Configure CMake
+      shell: bash
+      working-directory: ${{runner.workspace}}/build
+      run: cmake $GITHUB_WORKSPACE -G Ninja -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+
+    - name: Build
+      working-directory: ${{runner.workspace}}/build
+      shell: bash
+      run: cmake --build . --config $BUILD_TYPE
+
+    # TODO(cblichmann): Before enabling this, make sure all OSS tests pass
+    #- name: Test
+    #  working-directory: ${{runner.workspace}}/build
+    #  shell: bash
+    #  run: ctest -C $BUILD_TYPE