CI workflow (allegro/ralph)

The CI workflow from allegro/ralph, explained and optimized by Latchkey.

CI health: C - fair

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Source: allegro/ralph.github/workflows/main.ymlLicense Apache-2.0View source

What it does

This is the CI workflow from the allegro/ralph repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)

---
name: CI

on:
  push:
  pull_request:
    branches: [ ng ]

jobs:
  ci:
    name: Tests
    runs-on: ubuntu-22.04
    strategy:
      fail-fast: false
      matrix:
        db-engine: ["ci-psql", "ci-mysql"]
    env:
        MISE_ENV: ${{ matrix.db-engine }}
        DATABASE_USER: ralph_ng
        DATABASE_PASSWORD: ralph_ng
    services:
      postgres:
        image: postgres:14.17
        env:
          POSTGRES_USER: ralph_ng
          POSTGRES_PASSWORD: ralph_ng
        ports:
          - 5432:5432
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
      mysql:
        image: mysql:8.0
        env:
          MYSQL_ROOT_PASSWORD: root
          MYSQL_USER: ralph_ng
          MYSQL_PASSWORD: ralph_ng
          MYSQL_DATABASE: ralph_ng
        ports:
          - 3306:3306
        options: >-
          --health-cmd "mysqladmin ping --silent"
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
      redis:
        image: redis
        ports:
          - 6379:6379
        options: >-
          --health-cmd "redis-cli ping"
          --health-interval 10s
          --health-timeout 5s

    steps:
      - name: Grant test database permissions for MySQL
        if: matrix.db-engine == 'ci-mysql'
        run: |
          mysql -h127.0.0.1 -uroot -proot -e "GRANT ALL PRIVILEGES ON *.* TO 'ralph_ng'@'%' WITH GRANT OPTION;"
          mysql -h127.0.0.1 -uroot -proot -e "FLUSH PRIVILEGES;"

      - name: Checkout source code
        uses: actions/checkout@v2

      - name: Unshallow local copy
        run: git fetch --prune --unshallow

      - name: Install system packages
        run: |
          sudo apt-get update
          sudo apt-get -y --no-install-recommends install libldap2-dev libsasl2-dev libssl-dev

      - name: Install and configure Mise
        run: |
          curl https://mise.run | sh
          echo "$HOME/.local/share/mise/bin" >> $GITHUB_PATH
          echo "$HOME/.local/share/mise/shims" >> $GITHUB_PATH

      - name: Mise install tools
        run: |
          mise install uv ruff

      - name: Check formatting
        run: mise run checks

      - name: Check missing migrations
        run: mise run check-missing-migrations

      - name: Test Ralph's test settings
        run: mise run manage >/dev/null
        env:
          DJANGO_SETTINGS_MODULE: ralph.settings.test

      - name: Test Ralph's prod settings
        run: mise run manage >/dev/null
        env:
          DJANGO_SETTINGS_MODULE: ralph.settings.prod

      - name: Test Ralph with coverage
        run: mise run coverage

The same workflow, on Latchkey

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

---
name: CI
 
on:
  push:
  pull_request:
    branches: [ ng ]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  ci:
    timeout-minutes: 30
    name: Tests
    runs-on: latchkey-small
    strategy:
      fail-fast: false
      matrix:
        db-engine: ["ci-psql", "ci-mysql"]
    env:
        MISE_ENV: ${{ matrix.db-engine }}
        DATABASE_USER: ralph_ng
        DATABASE_PASSWORD: ralph_ng
    services:
      postgres:
        image: postgres:14.17
        env:
          POSTGRES_USER: ralph_ng
          POSTGRES_PASSWORD: ralph_ng
        ports:
          - 5432:5432
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
      mysql:
        image: mysql:8.0
        env:
          MYSQL_ROOT_PASSWORD: root
          MYSQL_USER: ralph_ng
          MYSQL_PASSWORD: ralph_ng
          MYSQL_DATABASE: ralph_ng
        ports:
          - 3306:3306
        options: >-
          --health-cmd "mysqladmin ping --silent"
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
      redis:
        image: redis
        ports:
          - 6379:6379
        options: >-
          --health-cmd "redis-cli ping"
          --health-interval 10s
          --health-timeout 5s
 
    steps:
      - name: Grant test database permissions for MySQL
        if: matrix.db-engine == 'ci-mysql'
        run: |
          mysql -h127.0.0.1 -uroot -proot -e "GRANT ALL PRIVILEGES ON *.* TO 'ralph_ng'@'%' WITH GRANT OPTION;"
          mysql -h127.0.0.1 -uroot -proot -e "FLUSH PRIVILEGES;"
 
      - name: Checkout source code
        uses: actions/checkout@v2
 
      - name: Unshallow local copy
        run: git fetch --prune --unshallow
 
      - name: Install system packages
        run: |
          sudo apt-get update
          sudo apt-get -y --no-install-recommends install libldap2-dev libsasl2-dev libssl-dev
 
      - name: Install and configure Mise
        run: |
          curl https://mise.run | sh
          echo "$HOME/.local/share/mise/bin" >> $GITHUB_PATH
          echo "$HOME/.local/share/mise/shims" >> $GITHUB_PATH
 
      - name: Mise install tools
        run: |
          mise install uv ruff
 
      - name: Check formatting
        run: mise run checks
 
      - name: Check missing migrations
        run: mise run check-missing-migrations
 
      - name: Test Ralph's test settings
        run: mise run manage >/dev/null
        env:
          DJANGO_SETTINGS_MODULE: ralph.settings.test
 
      - name: Test Ralph's prod settings
        run: mise run manage >/dev/null
        env:
          DJANGO_SETTINGS_MODULE: ralph.settings.prod
 
      - name: Test Ralph with coverage
        run: mise run coverage

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.

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
Network fetches

This workflow runs 1 job (2 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