Test workflow (jazzband/geojson)

The Test workflow from jazzband/geojson, explained and optimized by Latchkey.

What it does

This is the Test workflow from the jazzband/geojson 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

name: Test

on: [push, pull_request, workflow_dispatch]

env:
  FORCE_COLOR: 1

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        python-version: ['pypy3.10', '3.10', '3.11', '3.12', '3.13', '3.14']

    steps:
    - uses: actions/checkout@v6

    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v6
      with:
        python-version: ${{ matrix.python-version }}
        allow-prereleases: true
        cache: pip
        cache-dependency-path: tox.ini

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

    - name: Tests
      run: |
          tox -e py

    - name: Upload coverage
      uses: codecov/codecov-action@v6
      with:
        name: Python ${{ matrix.python-version }}

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: Test
 
on: [push, pull_request, workflow_dispatch]
 
env:
  FORCE_COLOR: 1
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      fail-fast: false
      matrix:
        python-version: ['pypy3.10', '3.10', '3.11', '3.12', '3.13', '3.14']
 
    steps:
    - uses: actions/checkout@v6
 
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v6
      with:
        python-version: ${{ matrix.python-version }}
        allow-prereleases: true
        cache: pip
        cache-dependency-path: tox.ini
 
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        python -m pip install --upgrade tox
 
    - name: Tests
      run: |
          tox -e py
 
    - name: Upload coverage
      uses: codecov/codecov-action@v6
      with:
        name: Python ${{ matrix.python-version }}
 

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.
• Add a job timeout so a hung step cannot burn hours of runner time.

1 third-party action is referenced by a movable tag. Pin it to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

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 (6 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