Linters and tests workflow (MahjongRepository/mahjong)

The Linters and tests workflow from MahjongRepository/mahjong, explained and optimized by Latchkey.

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Source: MahjongRepository/mahjong.github/workflows/lint_and_test.ymlLicense MITView source

What it does

This is the Linters and tests workflow from the MahjongRepository/mahjong 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: Linters and tests

on:
  push:
    paths:
      - mahjong/**
    branches:
      - master

  pull_request:
    branches:
      - master

jobs:
  lint:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@v6
        with:
          persist-credentials: false

      - name: Install the latest version of uv
        uses: astral-sh/setup-uv@v8.1.0
        with:
          python-version: "3.10"

      - name: Install libs
        run: uv sync --no-group dev --group lint

      - name: Lint files
        run: make lint

  typecheck:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@v6
        with:
          persist-credentials: false

      - name: Install the latest version of uv
        uses: astral-sh/setup-uv@v8.1.0
        with:
          python-version: "3.10"

      - name: Install libs
        run: uv sync --no-group dev --group typing

      - name: Check files
        run: make type

  tests:
    needs: [lint, typecheck]
    runs-on: ubuntu-latest
    timeout-minutes: 10
    strategy:
      matrix:
        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "pypy3.10", "pypy3.11"]
    steps:
      - uses: actions/checkout@v6
        with:
          persist-credentials: false

      - name: Install the latest version of uv and set the python version
        uses: astral-sh/setup-uv@v8.1.0
        with:
          python-version: ${{ matrix.python-version }}

      - name: Test with python ${{ matrix.python-version }}
        run: make tests

The same workflow, on Latchkey

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

name: Linters and tests
 
on:
  push:
    paths:
      - mahjong/**
    branches:
      - master
 
  pull_request:
    branches:
      - master
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  lint:
    runs-on: latchkey-small
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@v6
        with:
          persist-credentials: false
 
      - name: Install the latest version of uv
        uses: astral-sh/setup-uv@v8.1.0
        with:
          python-version: "3.10"
 
      - name: Install libs
        run: uv sync --no-group dev --group lint
 
      - name: Lint files
        run: make lint
 
  typecheck:
    runs-on: latchkey-small
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@v6
        with:
          persist-credentials: false
 
      - name: Install the latest version of uv
        uses: astral-sh/setup-uv@v8.1.0
        with:
          python-version: "3.10"
 
      - name: Install libs
        run: uv sync --no-group dev --group typing
 
      - name: Check files
        run: make type
 
  tests:
    needs: [lint, typecheck]
    runs-on: latchkey-small
    timeout-minutes: 10
    strategy:
      matrix:
        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "pypy3.10", "pypy3.11"]
    steps:
      - uses: actions/checkout@v6
        with:
          persist-credentials: false
 
      - name: Install the latest version of uv and set the python version
        uses: astral-sh/setup-uv@v8.1.0
        with:
          python-version: ${{ matrix.python-version }}
 
      - name: Test with python ${{ matrix.python-version }}
        run: make tests

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.

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 3 jobs (9 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 astral-sh/setup-uv