ci workflow (fastapi-practices/fastapi-best-architecture)

The ci workflow from fastapi-practices/fastapi-best-architecture, explained and optimized by Latchkey.

What it does

This is the ci workflow from the fastapi-practices/fastapi-best-architecture 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: ci

on:
  push:
    branches:
      - master
  pull_request:

jobs:
  lint:
    runs-on: ubuntu-latest
    name: lint ${{ matrix.python-version }}
    strategy:
      matrix:
        python-version: [ '3.10', '3.11', '3.12', '3.13', '3.14' ]
      fail-fast: false
    steps:
      - uses: actions/checkout@v6

      - name: Install uv
        uses: astral-sh/setup-uv@v7

      - name: Set up Python ${{ matrix.python-version }}
        run: uv python install ${{ matrix.python-version }}

      - name: Install dependencies
        run: |
          uv sync --only-group lint

      - name: Run lint
        run: |
          source .venv/bin/activate
          chmod 755 backend/scripts/lint.sh
          ./backend/scripts/lint.sh

The same workflow, on Latchkey

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

name: ci
 
on:
  push:
    branches:
      - master
  pull_request:
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  lint:
    timeout-minutes: 30
    runs-on: latchkey-small
    name: lint ${{ matrix.python-version }}
    strategy:
      matrix:
        python-version: [ '3.10', '3.11', '3.12', '3.13', '3.14' ]
      fail-fast: false
    steps:
      - uses: actions/checkout@v6
 
      - name: Install uv
        uses: astral-sh/setup-uv@v7
 
      - name: Set up Python ${{ matrix.python-version }}
        run: uv python install ${{ matrix.python-version }}
 
      - name: Install dependencies
        run: |
          uv sync --only-group lint
 
      - name: Run lint
        run: |
          source .venv/bin/activate
          chmod 755 backend/scripts/lint.sh
          ./backend/scripts/lint.sh
 

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• Cancel superseded runs when a branch or PR gets a newer push.
• 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 (5 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