CI: Add dedicated workflow for notebook testing

.github/workflows/basictest.yml

@@ -172,26 +172,6 @@ jobs:
         python3 -c 'import NCrystal; NCrystal.test()'
         . ${{github.workspace}}/install/ncrystal_unsetup.sh
 
-    - name: Checkout ncrystal-notebooks
-      if: matrix.python != '3.7' && matrix.python != '3.8'
-      uses: actions/checkout@v4
-      with:
-        repository: mctools/ncrystal-notebooks
-        path: src_notebooks
-
-    - name: Extra pip install for notebooks
-      if: matrix.python != '3.7' && matrix.python != '3.8'
-      run: |
-        set -eu
-        python3 -m pip install numpy matplotlib spglib ase gemmi jupyterlab ipympl
-
-    - name: Test notebooks
-      if: matrix.python != '3.7' && matrix.python != '3.8'
-      run: |
-        set -eu
-        eval $(${{github.workspace}}/install/bin/ncrystal-config --setup)
-        ./src_notebooks/.github/resources/run_notebooks.x
-
     #Final step, so tmate step can check if we got this far.
     - name: Final
       id: final-step

.github/workflows/test_notebooks.yml

@@ -0,0 +1,52 @@
+name: notebooks
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '30 21 * * 0'  # 21:30 every Sunday
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        include:
+           #Note: Python 3.13 works (Aug 2024) because of the
+           #"allow-prereleases: true" below.
+          - { os: ubuntu-latest, CC: gcc,      CXX: g++,        python: '3.9' }
+          - { os: ubuntu-latest, CC: gcc,      CXX: g++,        python: '3.13' }
+          - { os: macos-latest,  CC: clang,    CXX: clang++,    python: "3.12" }
+    name: ${{ matrix.os }}.${{ matrix.CC }}.python-${{ matrix.python }}
+    runs-on: ${{ matrix.os }}
+    env:
+      CC: ${{ matrix.CC }}
+      CXX: ${{ matrix.CXX }}
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        path: src_ncrystal
+
+    - name: Setup python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python }}
+        allow-prereleases: true #Needed (Aug 2024) for Python 3.13.
+
+    - name: Pip install ncrystal
+      shell: cmd
+      run: python3 -m pip install ./src_ncrystal/
+
+    - name: Checkout ncrystal-notebooks
+      uses: actions/checkout@v4
+      with:
+        repository: mctools/ncrystal-notebooks
+        path: src_notebooks
+
+    - name: Extra pip install for notebooks
+      run: python3 -m pip install numpy matplotlib spglib ase gemmi jupyterlab ipympl
+
+    - name: Test notebooks
+      run: ./src_notebooks/.github/resources/run_notebooks.x
+