Python application workflow (TimMcCool/scratchattach)

The Python application workflow from TimMcCool/scratchattach, explained and optimized by Latchkey.

What it does

This is the Python application workflow from the TimMcCool/scratchattach 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

name: Python application

on:
  release:
    types: [published]
  workflow_dispatch:

permissions:
  contents: read

jobs:
  build:
    runs-on: ubuntu-latest
    environment: release
    permissions:
      id-token: write
    steps:
    - uses: actions/checkout@v7
    - uses: astral-sh/setup-uv@v7
    - name: Lint with ruff
      # ruff detects config from pyproject.toml
      run: uvx ruff check .
    - name: PyPI publish with uv
      run: |
        uv build
        uv publish

The same workflow, on Latchkey

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

name: Python application
 
on:
  release:
    types: [published]
  workflow_dispatch:
 
permissions:
  contents: read
 
jobs:
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
    environment: release
    permissions:
      id-token: write
    steps:
    - uses: actions/checkout@v7
    - uses: astral-sh/setup-uv@v7
    - name: Lint with ruff
      # ruff detects config from pyproject.toml
      run: uvx ruff check .
    - name: PyPI publish with uv
      run: |
        uv build
        uv publish
 

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.
• 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.

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