Add an examples CI job

.github/workflows/ci.yml

@@ -90,6 +90,21 @@ jobs:
                 build_py_project_in_conda_env
                 build_docs
 
+    examples:
+        name: Examples
+        runs-on: ubuntu-latest
+        steps:
+        -   uses: actions/checkout@v2
+        -   name: "Main Script"
+            run: |
+                CONDA_ENVIRONMENT=.test-conda-env-py3.yml
+                curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/ci-support.sh
+                . ci-support.sh
+                EXTRA_INSTALL="pillow cgen"
+                build_py_project_in_conda_env
+                (cd examples; rm -f gl_*)
+                run_examples
+
     wheels:
         name: Build and upload wheels
         runs-on: ubuntu-latest