CI workflow (alecthomas/kingpin)

The CI workflow from alecthomas/kingpin, explained and optimized by Latchkey.

What it does

This is the CI workflow from the alecthomas/kingpin 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

on:
  push:
    branches:
      - master
  pull_request:
name: CI
jobs:
  test:
    name: Test
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v7
      - name: Init Hermit
        run: ./bin/hermit env -r >> $GITHUB_ENV
      - name: Test
        run: go test ./...

The same workflow, on Latchkey

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

on:
  push:
    branches:
      - master
  pull_request:
name: CI
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  test:
    timeout-minutes: 30
    name: Test
    runs-on: latchkey-small
    steps:
      - name: Checkout code
        uses: actions/checkout@v7
      - name: Init Hermit
        run: ./bin/hermit env -r >> $GITHUB_ENV
      - name: Test
        run: go test ./...
 

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• Cancel superseded runs when a branch or PR gets a newer push.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

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

Actions used in this workflow