Add examples folder

.github/workflows/pytest.yml

@@ -52,6 +52,8 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
+          # Include examples in the package, so that the tests can access them.
+          echo "include examples/*" >> MANIFEST.in
           pip install ".[all]"
           pip install pytest pytest-xdist pytest-env>=0.6 memory-profiler==0.61.0