github-ci
Write and maintain GitHub Actions CI workflows, including workflow YAML structure, triggers, runners, matrix builds, caching, testing patterns, and secrets management. Use when working with .github/workflows, GitHub Actions, CI pipelines, workflow dispatch, or action configuration.
What this skill does
# GitHub CI
Write and maintain GitHub Actions CI workflows with confidence. This skill covers workflow design, runner configuration, testing patterns, and security best practices for continuous integration pipelines on GitHub.
---
## Intent Router
Load reference files for depth on specific topics:
| Topic | File | Load when... |
| --- | --- | --- |
| Workflow Basics | `resources/workflow-basics.md` | Learning workflow YAML structure, triggers, jobs, and built-in actions |
| Runners & Caching | `resources/runners-and-caching.md` | Configuring runners, setting up caching, or optimizing build performance |
| Testing Patterns | `resources/testing-patterns.md` | Implementing test runs, reporting results, or integrating coverage tools |
| Security & Secrets | `resources/security-and-secrets.md` | Managing secrets, permissions, and third-party action safety |
---
## Quick Start
### Basic GitHub Actions Workflow
1. **Create workflow file** — Save as `.github/workflows/ci.yml` in repository root
2. **Define triggers** — Use `on:` to specify when workflow runs (push, pull_request, schedule)
3. **Configure job** — Define jobs with name, runner type, and steps
4. **Add checkout** — Use `actions/checkout@v4` to access repository code
5. **Run commands** — Add steps with `run:` or use community actions
### Minimal Workflow
```yaml
name: CI
on:
push:
branches: [main]
pull_request:
branches: [main]
jobs:
test:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- run: echo "Running CI pipeline"
```
### Workflow Anatomy
```yaml
workflow
├── name: Display name
├── on: Trigger events (push, pull_request, schedule, workflow_dispatch)
├── env: Workflow-level environment variables
└── jobs:
└── <job-name>:
├── runs-on: Runner type (ubuntu-latest, windows-latest, macos-latest)
├── env: Job-level environment variables
├── strategy: Matrix, fail-fast, max-parallel settings
└── steps:
├── uses: Pre-built action
└── run: Shell command or script
```
### File Location
All workflows must be in `.github/workflows/` directory with `.yml` or `.yaml` extension. Use kebab-case for filenames: `build-and-test.yml`, `deploy-production.yml`.
### Quick Validation
Validate YAML syntax before pushing:
```bash
docker run --rm -v "$(pwd):/data" pipelinecomponents/yamllint yamllint /data/.github/workflows/
```
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