Build wheels workflow (PythonOT/POT)

The Build wheels workflow from PythonOT/POT, explained and optimized by Latchkey.

What it does

This is the Build wheels workflow from the PythonOT/POT repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

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

The workflow

name: Build wheels

on:
  workflow_dispatch:
  release:
  pull_request:

jobs:
  build_wheels:
    name: ${{ matrix.os }}
    runs-on: ${{ matrix.os }}
    if: "contains(github.event.head_commit.message, 'build wheels')"
    strategy:
      matrix:
        os: [ubuntu-latest, ubuntu-24.04-arm, macos-latest, windows-latest]

    steps:
    - uses: actions/checkout@v7
      with:
        submodules: true
    - name: Set up Python 3.11
      uses: actions/setup-python@v6
      with:
        python-version: "3.11"

    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip setuptools

    - name: Install cibuildwheel
      run: |
        python -m pip install cibuildwheel==3.1.4

    - name: Build wheels
      env:
        CIBW_SKIP: "cp38* cp*musl* *i686 *win32" # remove pypy on mac and win (wrong version)
      run: |
        python -m cibuildwheel --output-dir wheelhouse

    - uses: actions/upload-artifact@v4
      with:
        name: wheels-${{ strategy.job-index }}
        path: ./wheelhouse

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: Build wheels
 
on:
  workflow_dispatch:
  release:
  pull_request:
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build_wheels:
    timeout-minutes: 30
    name: ${{ matrix.os }}
    runs-on: ${{ matrix.os }}
    if: "contains(github.event.head_commit.message, 'build wheels')"
    strategy:
      matrix:
        os: [ubuntu-latest, ubuntu-24.04-arm, macos-latest, windows-latest]
 
    steps:
    - uses: actions/checkout@v7
      with:
        submodules: true
    - name: Set up Python 3.11
      uses: actions/setup-python@v6
      with:
        cache: 'pip'
        python-version: "3.11"
 
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip setuptools
 
    - name: Install cibuildwheel
      run: |
        python -m pip install cibuildwheel==3.1.4
 
    - name: Build wheels
      env:
        CIBW_SKIP: "cp38* cp*musl* *i686 *win32" # remove pypy on mac and win (wrong version)
      run: |
        python -m cibuildwheel --output-dir wheelhouse
 
    - uses: actions/upload-artifact@v4
      with:
        name: wheels-${{ strategy.job-index }}
        path: ./wheelhouse
 

What changed

• Cancel superseded runs when a branch or PR gets a newer push.
• 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.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

• Dependency installs

This workflow runs 1 job (4 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