GitHub Actions

Overview

A workflow is a YAML file in .github/workflows/. It reacts to events (push, pull request, schedule, manual), runs one or more jobs on fresh runners, and each job runs steps: shell commands or reusable actions. This skill uses the action majors current in October 2026, all running on Node 24: actions/checkout@v7, actions/setup-node@v7, actions/cache@v6, actions/upload-artifact@v7, actions/download-artifact@v8, docker/login-action@v4, docker/setup-buildx-action@v4, docker/build-push-action@v7, actions/github-script@v9. Check a new action's latest major on its Releases page before copying a version from an old blog post.

Instructions

1. Minimal CI workflow

# .github/workflows/ci.yml
name: CI

on:
  push:
    branches: [main]
  pull_request: