Add action to test run demo notebooks

Author: dalito

.github/workflows/test-demo-notebooks.yml

@@ -0,0 +1,48 @@
+name: Test demo notebooks
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "demo/**"
+      - ".github/workflows/test-demo-notebooks.yml"
+  pull_request:
+    paths:
+      - "demo/**"
+      - ".github/workflows/test-demo-notebooks.yml"
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+permissions: {}
+
+jobs:
+  test-notebook:
+    name: Execute demo notebooks (${{ matrix.os }}, py${{ matrix.python-version }})
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 10
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        python-version: ["3.10", "3.14"]
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: pip install -r demo/requirements.in
+
+      - name: Execute notebook
+        run: >
+          jupyter nbconvert --to notebook --execute
+          --ExecutePreprocessor.timeout=300
+          demo/explore-voc4cat.ipynb