Build & Test workflow (wmayner/pyemd)

The Build & Test workflow from wmayner/pyemd, explained and optimized by Latchkey.

CI health: D - needs work

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Source: wmayner/pyemd.github/workflows/build_wheels.ymlLicense MITView source

What it does

This is the Build & Test workflow from the wmayner/pyemd 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

workflow (.yml)

name: Build & Test

on: ['push', 'pull_request']

jobs:
  test:
    name: Test on Python ${{ matrix.python-version }}
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: ['3.12', '3.13']

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}

      - name: Install package and test dependencies
        run: pip install -e .[test]

      - name: Run tests
        run: pytest

  build:
    name: Build wheel and sdist
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'

      - name: Install build tools
        run: pip install build

      - name: Build wheel and sdist
        run: python -m build

      - name: Upload wheel
        uses: actions/upload-artifact@v4
        with:
          name: wheel
          path: dist/*.whl

      - name: Upload sdist
        uses: actions/upload-artifact@v4
        with:
          name: sdist
          path: dist/*.tar.gz

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 & Test
 
on: ['push', 'pull_request']
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  test:
    timeout-minutes: 30
    name: Test on Python ${{ matrix.python-version }}
    runs-on: latchkey-small
    strategy:
      matrix:
        python-version: ['3.12', '3.13']
 
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
 
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
 
      - name: Install package and test dependencies
        run: pip install -e .[test]
 
      - name: Run tests
        run: pytest
 
  build:
    timeout-minutes: 30
    name: Build wheel and sdist
    runs-on: latchkey-small
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
 
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: '3.12'
 
      - name: Install build tools
        run: pip install build
 
      - name: Build wheel and sdist
        run: python -m build
 
      - name: Upload wheel
        uses: actions/upload-artifact@v4
        with:
          name: wheel
          path: dist/*.whl
 
      - name: Upload sdist
        uses: actions/upload-artifact@v4
        with:
          name: sdist
          path: dist/*.tar.gz

What changed

Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
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 2 jobs (3 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 actions/setup-python actions/upload-artifact