lint workflow (braintrustdata/autoevals)

The lint workflow from braintrustdata/autoevals, explained and optimized by Latchkey.

What it does

This is the lint workflow from the braintrustdata/autoevals 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

# Source: https://github.com/marketplace/actions/pre-commit
name: lint

on:
  pull_request:
  push:
    branches: [main]

jobs:
  lint:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
        with:
          python-version: "3.12"
      - name: Cache pre-commit
        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
        with:
          path: ~/.cache/pre-commit
          key: pre-commit-${{ runner.os }}-${{ hashFiles('.pre-commit-config.yaml') }}
      - name: Set up uv
        uses: astral-sh/setup-uv@94527f2e458b27549849d47d273a16bec83a01e9 # v7
        with:
          enable-cache: true
      - name: Install dependencies
        run: uv sync --extra dev
      - name: Run pre-commit
        run: uv run pre-commit run --all-files

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.

# Source: https://github.com/marketplace/actions/pre-commit
name: lint
 
on:
  pull_request:
  push:
    branches: [main]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  lint:
    runs-on: latchkey-small
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
        with:
          cache: 'pip'
          python-version: "3.12"
      - name: Cache pre-commit
        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
        with:
          path: ~/.cache/pre-commit
          key: pre-commit-${{ runner.os }}-${{ hashFiles('.pre-commit-config.yaml') }}
      - name: Set up uv
        uses: astral-sh/setup-uv@94527f2e458b27549849d47d273a16bec83a01e9 # v7
        with:
          enable-cache: true
      - name: Install dependencies
        run: uv sync --extra dev
      - name: Run pre-commit
        run: uv run pre-commit run --all-files
 

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.

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