ci: add tox reusable workflow

[cesarcoatl]

Summary by Sourcery

Introduce a reusable tox workflow and update CI and publish workflows to use it for package and stub testing.

Enhancements:

• Add a reusable tox workflow that encapsulates package and stubs tox jobs, parameterized by checkout ref.

CI:

• Replace separate tox-package and tox-stubs jobs in CI with a single job that calls a shared tox reusable workflow.
• Update CI branch filters to only run on the 8.1 branch for push and pull_request events.
• Refactor the publish workflow to use the new reusable tox workflow and depend on its completion before uploading to PyPI.

[sourcery-ai]

Reviewer's Guide

Introduces a reusable tox workflow and updates existing CI and publish workflows to call it, simplifying tox job configuration and dependencies while narrowing branch triggers.

Flow diagram for updated CI workflow calling reusable tox workflow

flowchart TD
  A[Push to branch 8.1] --> B[Run ci workflow]
  C[Pull request targeting branch 8.1] --> B

  subgraph CI_Jobs[ci workflow jobs]
    B --> D[Job pre-commit
runs on ubuntu-latest]
    C --> E[Job tox
if event is pull_request]
  end

  subgraph Reusable_Tox[tox reusable workflow]
    E --> F[workflow_call with input checkout-ref]
    F --> G[tox-package job
uses tox-docker reusable workflow]
    F --> H[tox-stubs job
uses tox reusable workflow]
  end

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Flow diagram for updated publish workflow calling reusable tox workflow

flowchart TD
  A[Release published event] --> B[Run publish workflow]

  subgraph Publish_Jobs[publish workflow jobs]
    B --> C[Job tox
uses reusable tox workflow]
    C --> D[pypi-upload job
needs tox]
  end

  subgraph Reusable_Tox[tox reusable workflow]
    C --> E[workflow_call with input checkout-ref
set from release tag]
    E --> F[tox-package job
uses tox-docker reusable workflow]
    E --> G[tox-stubs job
uses tox reusable workflow]
  end

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File-Level Changes

Change	Details	Files
Introduce a reusable tox workflow and consolidate tox-package and tox-stubs into it.	Create .github/workflows/tox.yml as a reusable workflow triggered via workflow_call with a checkout-ref input. Move tox-package job definition into the reusable workflow, still using the existing external tox-docker workflow. Move tox-stubs job definition into the reusable workflow, preserving Python versions and working-directory while parameterizing checkout-ref.	.github/workflows/tox.yml
Update CI workflow to consume the reusable tox workflow and adjust branch filters.	Change push and pull_request branch filters to only run on branch 8.1. Replace separate tox-package and tox-stubs jobs with a single tox job that calls the new reusable tox workflow, passing the current github.ref.	.github/workflows/ci.yml
Update publish workflow to consume the reusable tox workflow and simplify job dependencies.	Replace separate tox-package and tox-stubs jobs with a single tox job that calls the new reusable tox workflow, passing the release tag as checkout-ref. Update pypi-upload job to depend on the unified tox job instead of both tox-package and tox-stubs.	.github/workflows/publish.yml

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[sourcery-ai]

Hey - I've left some high level feedback:

• The CI workflow no longer runs on the 8.3 branch for either push or pull_request events; double-check that dropping 8.3 from CI triggers is intentional and not an accidental regression.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The CI workflow no longer runs on the `8.3` branch for either `push` or `pull_request` events; double-check that dropping `8.3` from CI triggers is intentional and not an accidental regression.

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