Add a CI workflow to test example notebooks

.github/workflows/test-notebooks.yml

@@ -0,0 +1,42 @@
+name: Notebooks
+
+on: [push, pull_request]
+
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  test-notebooks:
+    name: Check notebooks
+    if:
+      github.event_name == 'push' || github.event.pull_request.head.repo.full_name !=
+      github.repository
+
+    runs-on: ${{ matrix.os }}
+
+    defaults:
+      run:
+        shell: bash -l {0}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ["3.12"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: conda-incubator/setup-miniconda@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+          miniforge-variant: Miniforge3
+          miniforge-version: latest
+          auto-update-conda: true
+
+      - name: Test Jupyter notebooks
+        env:
+          MPLBACKEND: "Agg"
+        run: |
+          pip install nox
+          nox --verbose -s test-notebooks --force-pythons="${{ matrix.python-version }}"