Nightly race tests workflow (pallets/click)

The Nightly race tests workflow from pallets/click, explained and optimized by Latchkey.

CI health: C - fair

Run this on Latchkey for self-healing, caching, and up to 58% lower cost.

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Source: pallets/click.github/workflows/nightly.yamlLicense BSD-3-ClauseView source

What it does

This is the Nightly race tests workflow from the pallets/click repository, a real project running GitHub Actions. It is shown here with attribution under its BSD-3-Clause license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)

name: Nightly race tests
on:
  schedule:
    - cron: '0 6 * * *'
  workflow_dispatch:
permissions: {}
concurrency:
  group: ${{ github.workflow }}
  cancel-in-progress: false
jobs:
  race-tests:
    name: ${{ matrix.config.name }} (${{ matrix.branch }})
    runs-on: ${{ matrix.config.os || 'ubuntu-latest' }}
    strategy:
      fail-fast: false
      matrix:
        branch: [main, stable]
        config:
          - {name: Random 3.14, python: '3.14', tox: random}
          - {name: Random 3.14t, python: '3.14t', tox: random}
          - {name: Random 3.13, python: '3.13', tox: random}
          - {name: Random 3.12, python: '3.12', tox: random}
          - {name: Random 3.11, python: '3.11', tox: random}
          - {name: Random 3.10, python: '3.10', tox: random}
          - {name: Random Windows, python: '3.14', tox: random, os: windows-latest}
          - {name: Random Mac, python: '3.14', tox: random, os: macos-latest}
          - {name: Stress 3.14, python: '3.14', tox: stress-py3.14}
          - {name: Stress 3.14t, python: '3.14t', tox: stress-py3.14t}
          - {name: Stress Mac 3.14t, python: '3.14t', tox: stress-py3.14t, os: macos-latest}
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false
          ref: ${{ matrix.branch }}
      - uses: astral-sh/setup-uv@cec208311dfd045dd5311c1add060b2062131d57 # v8.0.0
        with:
          enable-cache: true
          prune-cache: false
      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
        with:
          python-version: ${{ matrix.config.python }}
      - run: uv run --locked --no-default-groups --group dev tox run
        env:
          TOX_ENV: ${{ matrix.config.tox }}

The same workflow, on Latchkey

Estimated ~20% faster on cache hits, plus fewer wasted runs and a safer supply chain. Added and changed lines are highlighted.

name: Nightly race tests
on:
  schedule:
    - cron: '0 6 * * *'
  workflow_dispatch:
permissions: {}
concurrency:
  group: ${{ github.workflow }}
  cancel-in-progress: false
jobs:
  race-tests:
    timeout-minutes: 30
    name: ${{ matrix.config.name }} (${{ matrix.branch }})
    runs-on: ${{ matrix.config.os || 'ubuntu-latest' }}
    strategy:
      fail-fast: false
      matrix:
        branch: [main, stable]
        config:
          - {name: Random 3.14, python: '3.14', tox: random}
          - {name: Random 3.14t, python: '3.14t', tox: random}
          - {name: Random 3.13, python: '3.13', tox: random}
          - {name: Random 3.12, python: '3.12', tox: random}
          - {name: Random 3.11, python: '3.11', tox: random}
          - {name: Random 3.10, python: '3.10', tox: random}
          - {name: Random Windows, python: '3.14', tox: random, os: windows-latest}
          - {name: Random Mac, python: '3.14', tox: random, os: macos-latest}
          - {name: Stress 3.14, python: '3.14', tox: stress-py3.14}
          - {name: Stress 3.14t, python: '3.14t', tox: stress-py3.14t}
          - {name: Stress Mac 3.14t, python: '3.14t', tox: stress-py3.14t, os: macos-latest}
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false
          ref: ${{ matrix.branch }}
      - uses: astral-sh/setup-uv@cec208311dfd045dd5311c1add060b2062131d57 # v8.0.0
        with:
          enable-cache: true
          prune-cache: false
      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
        with:
          cache: 'pip'
          python-version: ${{ matrix.config.python }}
      - run: uv run --locked --no-default-groups --group dev tox run
        env:
          TOX_ENV: ${{ matrix.config.tox }}

What changed

Cache dependency installs on the setup step so they are served from cache.
Add a job timeout so a hung step cannot burn hours of runner time.

This workflow runs 1 job (22 with the matrix expanded) per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout astral-sh/setup-uv actions/setup-python