CI: more debug to get all jobs to run

Author: bsipocz

.github/workflows/notebooks.yml

@@ -9,32 +9,37 @@ on:
     - main
   schedule:
     - cron: '0 5 * * 1'
+  workflow_dispatch:
 
 jobs:
   tests:
     name: ${{ matrix.os }} ${{ matrix.name }}
     runs-on: ${{ matrix.os }}
     strategy:
-      max-parallel: 12
+      # Don't cancel jobs if one is failing
+      fail-fast: false
       matrix:
-        os: [Ubuntu-latest, macOS-latest]
         include:
 
           - python-version: '3.8'
             toxenv: py38-test-oldestdeps
             name: with Python 3.8 and oldest versioned dependencies
+            os: ubuntu-latest
 
           - python-version: '3.9'
             toxenv: py39-test
             name: with Python 3.9
+            os: ubuntu-latest
 
           - python-version: '3.10'
             toxenv: py310-test
             name: with Python 3.10
+            os: macos-latest
 
           - python-version: '3.11'
             toxenv: py311-test-devdeps
             name: with Python 3.11 with developer versioned dependencies
+            os: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v3