Squash tests workflow (goldmann/docker-squash)

The Squash tests workflow from goldmann/docker-squash, explained and optimized by Latchkey.

CI health: D - needs work

Point runs-on at Latchkey and get caching, run de-duplication, job timeouts, self-healing for flaky steps, and up to 58% lower cost, applied automatically.

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Source: goldmann/docker-squash.github/workflows/squash.ymlLicense MITView source

What it does

This is the Squash tests workflow from the goldmann/docker-squash 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: Squash tests

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

jobs:
  build-docker-24:
    runs-on: ubuntu-22.04
    strategy:
      fail-fast: false
      matrix:
        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}
      - name: Setup
        run: |
          sudo apt-get update
          pip install "tox<4.0.0" setuptools
      - name: Info
        run: |
          docker version
          docker info
      - name: Run tests
        run: |
          PV=${{ matrix.python-version }}
          echo "Running tests for Python version  $PV ( ${PV/./} )"
          make test-py"${PV/./}"
  build-docker-25:
    runs-on: ubuntu-22.04
    strategy:
      fail-fast: false
      matrix:
        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}
      - name: Setup
        run: |
          for pkg in containerd runc; do sudo apt-get remove $pkg; done
          sudo apt-get update
          sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
          sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu jammy stable"
          apt-cache policy docker-ce
          sudo apt-get install docker-ce docker-ce-cli containerd.io
          pip install "tox<4.0.0" setuptools
      - name: Info
        run: |
          docker version
          docker info
      - name: Run tests
        run: |
          PV=${{ matrix.python-version }}
          echo "Running tests for Python version  $PV ( ${PV/./} )"
          make test-py"${PV/./}"
  build-podman-3:
    runs-on: ubuntu-22.04
    strategy:
      fail-fast: false
      matrix:
        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}
      - name: Setup
        run: |
          sudo apt-get update
          pip install "tox<4.0.0" setuptools
      - name: Info
        run: |
          podman version
          podman info
      - name: Run tests
        run: |
          systemctl --user start podman.socket
          export DOCKER_HOST=unix://$XDG_RUNTIME_DIR/podman/podman.sock
          PV=${{ matrix.python-version }}
          echo "Running tests for Python version  $PV ( ${PV/./} )"
          make test-py"${PV/./}"

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: Squash tests
 
on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build-docker-24:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      fail-fast: false
      matrix:
        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
      - name: Setup
        run: |
          sudo apt-get update
          pip install "tox<4.0.0" setuptools
      - name: Info
        run: |
          docker version
          docker info
      - name: Run tests
        run: |
          PV=${{ matrix.python-version }}
          echo "Running tests for Python version  $PV ( ${PV/./} )"
          make test-py"${PV/./}"
  build-docker-25:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      fail-fast: false
      matrix:
        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
      - name: Setup
        run: |
          for pkg in containerd runc; do sudo apt-get remove $pkg; done
          sudo apt-get update
          sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
          sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu jammy stable"
          apt-cache policy docker-ce
          sudo apt-get install docker-ce docker-ce-cli containerd.io
          pip install "tox<4.0.0" setuptools
      - name: Info
        run: |
          docker version
          docker info
      - name: Run tests
        run: |
          PV=${{ matrix.python-version }}
          echo "Running tests for Python version  $PV ( ${PV/./} )"
          make test-py"${PV/./}"
  build-podman-3:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      fail-fast: false
      matrix:
        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
      - name: Setup
        run: |
          sudo apt-get update
          pip install "tox<4.0.0" setuptools
      - name: Info
        run: |
          podman version
          podman info
      - name: Run tests
        run: |
          systemctl --user start podman.socket
          export DOCKER_HOST=unix://$XDG_RUNTIME_DIR/podman/podman.sock
          PV=${{ matrix.python-version }}
          echo "Running tests for Python version  $PV ( ${PV/./} )"
          make test-py"${PV/./}"

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
Network fetches

This workflow runs 3 jobs (21 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