GitHub Actions for Rails

The default CI/CD for new Rails projects. Fast, free up to 2000 min/month for private repos, generous for public. This skill gives you a production-grade workflow file plus the principles (cache aggressively, parallelize tests, gate deploys on green main, OIDC over long-lived secrets).

The opinion

One workflow per concern (CI, Deploy, Security Scan). Parallelize tests via matrix. Cache gems, Yarn, and asset builds. Use the official ruby/setup-ruby action with bundler-cache: true. Use OIDC for AWS / GCP — never long-lived AWS_ACCESS_KEY_ID secrets. Deploy via Kamal on push to main, after CI passes. Branch protection on main: PR + 1 review + green CI + linear history.

Pattern 1: The CI workflow

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

on:
  pull_request:
  push:
    branches: [main]