ci: Add USE_GLPK=ON jobs

.github/workflows/cmake_glpk_on.yml

@@ -0,0 +1,21 @@
+name: CMake GLPK ON
+
+on: [push, pull_request]
+
+jobs:
+  # Building using the github runner environement directly.
+  linux_cpp:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Check cmake
+      run: cmake --version
+    - name: Configure
+      run: cmake -S. -Bbuild -DCMAKE_BUILD_TYPE=Release -DBUILD_DEPS=ON
+        -DBUILD_CXX=ON -DUSE_GLPK=ON -DUSE_SCIP=OFF -DUSE_COINOR=OFF
+    - name: Build
+      run: cmake --build build --config Release --target all -v
+    - name: Test
+      run: CTEST_OUTPUT_ON_FAILURE=1 cmake --build build --config Release --target test -v
+    - name: Install
+      run: cmake --build build --config Release --target install -v -- DESTDIR=install