ci: test building examples

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
         with:
-          submodules: recursive  
+          submodules: recursive
       - name: Install Linux dependencies
         run: |
           sudo apt-get update
@@ -55,4 +55,9 @@ jobs:
       # Build the whole project with Ninja (which is spawn by CMake).
       - name: Build
         run: |
-          cmake --build "${{ env.CMAKE_BUILD_DIR }}"
+          cmake --build "${{ env.CMAKE_BUILD_DIR }}"
+
+      # Build the examples which are excluded from all
+      - name: Build examples
+        run: |
+          cmake --build "${{ env.CMAKE_BUILD_DIR }}" --target examples