add pytest splits to speedup the notebook testing

Author: jakobkruse1

.github/workflows/main.yaml

@@ -85,12 +85,16 @@ jobs:
 
   notebook-tests:
     strategy:
+      fail-fast: false
       matrix:
         python_version: ["3.8", "3.9", "3.10", "3.11"]
-    name: Run Notebook tests -  Python ${{ matrix.python_version }}
+        group_number: [1, 2, 3, 4]
+    name: Run Notebook tests -  Python ${{ matrix.python_version }} - Group ${{ matrix.group_number }}
     uses: ./.github/workflows/run-notebook-tests-workflow.yaml
     with:
       python_version: ${{ matrix.python_version }}
+      split_size: 4
+      group_number: ${{ matrix.group_number }}
     needs: [code-quality]
 
   push-docs-and-release-testpypi:

.github/workflows/run-notebook-tests-workflow.yaml

@@ -3,6 +3,14 @@ name: Run Notebook Tests
 on:
   workflow_call:
     inputs:
+      split_size:
+        description: "Determines the number of groups into which the tests should be split"
+        type: string
+        default: 4
+      group_number:
+        description: "Determines which which group of tests to run. Can be 1, 2, ..., split_size"
+        type: string
+        required: true      
       python_version:
         description: "Determines which Python version to use"
         type: string
@@ -30,4 +38,5 @@ jobs:
     - name: Set up memcached
       uses: niden/actions-memcached@v7
     - name: Test Notebooks
-      run: tox -e notebook-tests
+      run: tox -e notebook-tests --splits ${{ inputs.split_size }} --group ${{ inputs.group_number }}
+