Test workflow (MTSWebServices/Ambrosia)

The Test workflow from MTSWebServices/Ambrosia, explained and optimized by Latchkey.

What it does

This is the Test workflow from the MTSWebServices/Ambrosia repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

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

The workflow

name: Test

on:
  push:
    branches:
      - "**"
  pull_request:
    branches:
      - main
      - dev

jobs:
  lint:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.11"

      - name: Install poetry
        run: pip install poetry>=1.5.0

      - name: Install dependencies
        run: make install

      - name: Static analysis
        run: make lint

  test:
    name: test (${{ matrix.python-version }})
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]

    steps:
      - uses: actions/checkout@v4

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

      - name: Install poetry
        run: pip install poetry>=1.5.0

      - name: Install dependencies
        run: make install

      - name: Run tests
        run: make test

      - name: Upload coverage
        uses: codecov/codecov-action@v4

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: Test
 
on:
  push:
    branches:
      - "**"
  pull_request:
    branches:
      - main
      - dev
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  lint:
    timeout-minutes: 30
    runs-on: latchkey-small
 
    steps:
      - uses: actions/checkout@v4
 
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: "3.11"
 
      - name: Install poetry
        run: pip install poetry>=1.5.0
 
      - name: Install dependencies
        run: make install
 
      - name: Static analysis
        run: make lint
 
  test:
    timeout-minutes: 30
    name: test (${{ matrix.python-version }})
    runs-on: latchkey-small
    strategy:
      fail-fast: false
      matrix:
        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
    steps:
      - uses: actions/checkout@v4
 
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
 
      - name: Install poetry
        run: pip install poetry>=1.5.0
 
      - name: Install dependencies
        run: make install
 
      - name: Run tests
        run: make test
 
      - name: Upload coverage
        uses: codecov/codecov-action@v4
 

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.

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 2 jobs (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