CI workflow (alacritty/alacritty)

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

What it does

This is the CI workflow from the alacritty/alacritty 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

name: CI

on: [push, pull_request]

env:
  CARGO_TERM_COLOR: always

jobs:
  build:
    strategy:
      matrix:
        os: [windows-latest, macos-latest]

    runs-on: ${{ matrix.os }}

    steps:
      - uses: actions/checkout@v4
      - name: Stable
        run: cargo test
      - name: Stable (no default features)
        run: cargo test -p alacritty_terminal --no-default-features
      - name: Oldstable
        run: |
          rustup default $(cat Cargo.toml | grep "rust-version" | sed 's/.*"\(.*\)".*/\1/')
          cargo test
      - name: Clippy
        run: |
          rustup component add clippy
          cargo clippy --all-targets
  check-macos-x86_64:
    runs-on: macos-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install target
        run: rustup update && rustup target add x86_64-apple-darwin
      - name: Build
        run: cargo build --target=x86_64-apple-darwin

The same workflow, on Latchkey

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

name: CI
 
on: [push, pull_request]
 
env:
  CARGO_TERM_COLOR: always
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
    strategy:
      matrix:
        os: [windows-latest, macos-latest]
 
    runs-on: ${{ matrix.os }}
 
    steps:
      - uses: actions/checkout@v4
      - name: Stable
        run: cargo test
      - name: Stable (no default features)
        run: cargo test -p alacritty_terminal --no-default-features
      - name: Oldstable
        run: |
          rustup default $(cat Cargo.toml | grep "rust-version" | sed 's/.*"\(.*\)".*/\1/')
          cargo test
      - name: Clippy
        run: |
          rustup component add clippy
          cargo clippy --all-targets
  check-macos-x86_64:
    timeout-minutes: 30
    runs-on: macos-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install target
        run: rustup update && rustup target add x86_64-apple-darwin
      - name: Build
        run: cargo build --target=x86_64-apple-darwin
 

What changed

• 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

This workflow runs 2 jobs (3 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