19 runners per python version

So, total 38 runners for a given run.

Note that there's a max of 40 runners across all repositories for my account (if I understood correctly): https://docs.github.com/en/actions/learn-github-actions/usage-limits-billing-and-administration#usage-limits

Jobs past this limit will get queued

.github/workflows/ci.yml

@@ -14,16 +14,13 @@ on:
   workflow_dispatch:  # Allow manually triggering the workflow
   schedule:
     # Run roughly every 15 days at 00:00 UTC
-    # (useful to check if updates on dependencies break the package)
-    - cron: '0 0 1,16 * *'
+    - cron: '0 0 1,16 * *'  # Run roughly every 15 days at 00:00 UTC
 
 permissions:
   contents: read
 
 concurrency:
-  group: >-
-    ${{ github.workflow }}-${{ github.ref_type }}-
-    ${{ github.event.pull_request.number || github.sha }}
+  group: ${{ github.workflow }}-${{ github.ref_type }}-${{ github.event.pull_request.number || github.sha }}
   cancel-in-progress: true
 
 jobs:
@@ -40,9 +37,7 @@ jobs:
       - name: Run static analysis and format checkers
         run: pipx run pre-commit run --all-files --show-diff-on-failure
       - name: Build package distribution files
-        run: >-
-          pipx run --python '${{ steps.setup-python.outputs.python-path }}'
-          tox -e clean,build
+        run: pipx run --python '${{ steps.setup-python.outputs.python-path }}' tox -e clean,build
       - name: Record the path of wheel distribution
         id: wheel-distribution
         run: echo "path=$(ls dist/*.whl)" >> $GITHUB_OUTPUT
@@ -66,6 +61,7 @@ jobs:
         - ubuntu-latest
         # - macos-latest
         # - windows-latest
+        group: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]  # number of groups
     runs-on: ${{ matrix.platform }}
     steps:
       - uses: actions/checkout@v3
@@ -77,10 +73,6 @@ jobs:
         uses: actions/download-artifact@v3
         with: {name: python-distribution-files, path: dist/}
       - name: Run tests
-        run: >-
-          pipx run --python '${{ steps.setup-python.outputs.python-path }}'
-          tox --installpkg '${{ needs.prepare.outputs.wheel-distribution }}'
-          -- -rFEx --durations 10 --color yes  # pytest args
   #     - name: Generate coverage report
   #       run: pipx run coverage lcov -o coverage.lcov
   #     - name: Upload partial coverage report
@@ -116,7 +108,7 @@ jobs:
         with: {name: python-distribution-files, path: dist/}
       - name: Publish Package
         env:
-          # TODO: Set your PYPI_TOKEN as a secret using GitHub UI
+          # Ensure PYPI_TOKEN set as a secret using GitHub UI
           # - https://pypi.org/help/#apitoken
           # - https://docs.github.com/en/actions/security-guides/encrypted-secrets
           TWINE_REPOSITORY: pypi