Build workflow (scrapinghub/dateparser)

The Build workflow from scrapinghub/dateparser, explained and optimized by Latchkey.

CI health: F - at risk

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

Grade your own workflow free or run it on Latchkey →

Source: scrapinghub/dateparser.github/workflows/main.ymlLicense BSD-3-ClauseView source

What it does

This is the Build workflow from the scrapinghub/dateparser 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

workflow (.yml)

name: Build
on:
  push:
    branches:
      - master
  pull_request:
    branches:
      - master
jobs:
  build:
    name: Build
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        include:
          - python-version: "3.14"
            toxenv: pre-commit
          - python-version: "3.10"
            toxenv: min
          - python-version: "3.10"
            toxenv: min-all
          - python-version: "3.11"
          - python-version: "3.12"
          - python-version: "3.14"
            toxenv: all
          - python-version: "3.14"
            toxenv: scripts
          - python-version: "3.14"
            toxenv: docs
          - python-version: "3.14"
            toxenv: twinecheck
          - python-version: "3.13"
            toxenv: py
            timezone: "Pacific/Auckland"
          - python-version: "3.13"
            toxenv: py
            timezone: "Pacific/Fiji"
    steps:
      - uses: actions/checkout@v3
      - name: 'Set up Python ${{ matrix.python-version }}'
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}
      - name: Install language-pack-fr
        run: sudo apt-get update && sudo apt-get install -y language-pack-fr build-essential
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install tox
      - name: Run tests
        run: |
          TZ=${{ matrix.timezone || 'UTC' }} echo "Running tests with timezone: $TZ"
          TZ=${{ matrix.timezone || 'UTC' }} tox -e ${{ matrix.toxenv || 'py' }}
      - name: Upload coverage.xml to codecov
        uses: codecov/codecov-action@v5
        with:
          token: ${{ secrets.CODECOV_TOKEN }}

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
on:
  push:
    branches:
      - master
  pull_request:
    branches:
      - master
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
    name: Build
    runs-on: latchkey-small
    strategy:
      fail-fast: false
      matrix:
        include:
          - python-version: "3.14"
            toxenv: pre-commit
          - python-version: "3.10"
            toxenv: min
          - python-version: "3.10"
            toxenv: min-all
          - python-version: "3.11"
          - python-version: "3.12"
          - python-version: "3.14"
            toxenv: all
          - python-version: "3.14"
            toxenv: scripts
          - python-version: "3.14"
            toxenv: docs
          - python-version: "3.14"
            toxenv: twinecheck
          - python-version: "3.13"
            toxenv: py
            timezone: "Pacific/Auckland"
          - python-version: "3.13"
            toxenv: py
            timezone: "Pacific/Fiji"
    steps:
      - uses: actions/checkout@v3
      - name: 'Set up Python ${{ matrix.python-version }}'
        uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
      - name: Install language-pack-fr
        run: sudo apt-get update && sudo apt-get install -y language-pack-fr build-essential
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install tox
      - name: Run tests
        run: |
          TZ=${{ matrix.timezone || 'UTC' }} echo "Running tests with timezone: $TZ"
          TZ=${{ matrix.timezone || 'UTC' }} tox -e ${{ matrix.toxenv || 'py' }}
      - name: Upload coverage.xml to codecov
        uses: codecov/codecov-action@v5
        with:
          token: ${{ secrets.CODECOV_TOKEN }}

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 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

actions/checkout actions/setup-python codecov/codecov-action