act-local-ci
# Act Local CI Skill
What this skill does
# Act Local CI Skill
**Quick Reference** - Test GitHub Actions workflows locally using nektos/act
## Mission
Run GitHub Actions workflows locally before pushing to validate CI/CD pipelines, catch errors early, and reduce iteration time. Uses [nektos/act](https://github.com/nektos/act) to simulate GitHub Actions runner environment.
## Core Capabilities
- **Local Workflow Execution**: Run `.github/workflows/*.yml` files locally
- **Job Selection**: Execute specific jobs or entire workflows
- **Event Simulation**: Trigger with push, pull_request, workflow_dispatch events
- **Secret Injection**: Pass secrets securely without committing
- **Matrix Testing**: Test matrix builds before pushing
- **Artifact Handling**: Capture and inspect build artifacts
## Quick Start
```bash
# Run all workflows (default push event)
act
# Run specific workflow
act -W .github/workflows/test.yml
# Run specific job
act -j build
# Simulate pull request event
act pull_request
# Pass secrets
act -s GITHUB_TOKEN=$GITHUB_TOKEN
# List available workflows and jobs
act -l
```
## Prerequisites
```bash
# Install act (macOS)
brew install act
# Install act (Linux)
curl https://raw.githubusercontent.com/nektos/act/master/install.sh | sudo bash
# Docker is required
docker --version # Must be installed and running
```
## Common Patterns
### Test Before Push
```bash
# Validate test workflow passes
act -j test --dryrun # Preview what would run
act -j test # Actually run tests
# If successful, push
git push origin feature-branch
```
### Debug Failing CI
```bash
# Run with verbose output
act -v
# Use specific runner image
act -P ubuntu-latest=catthehacker/ubuntu:act-latest
# Keep container for debugging
act --reuse
```
### Matrix Build Testing
```bash
# Run all matrix combinations
act -j build
# Run specific matrix combination
act -j build --matrix os:ubuntu-latest
```
## Runner Images
| GitHub Runner | Act Default | Recommended |
|---------------|-------------|-------------|
| `ubuntu-latest` | `node:16-buster-slim` | `catthehacker/ubuntu:act-latest` |
| `ubuntu-22.04` | `node:16-buster-slim` | `catthehacker/ubuntu:act-22.04` |
| `ubuntu-20.04` | `node:16-buster-slim` | `catthehacker/ubuntu:act-20.04` |
## Pass/Fail Criteria
**Pass**: Workflow executes successfully locally
- All jobs complete with exit code 0
- Artifacts generated as expected
- No timeout or resource errors
**Fail**: Local execution reveals issues
- Job fails with non-zero exit code
- Missing secrets or environment variables
- Docker resource constraints
- Unsupported GitHub Actions features
## Configuration
```yaml
# .actrc (project root)
-P ubuntu-latest=catthehacker/ubuntu:act-latest
-P ubuntu-22.04=catthehacker/ubuntu:act-22.04
--secret-file .secrets
--env-file .env
```
```bash
# .secrets (gitignored)
GITHUB_TOKEN=ghp_xxxxxxxxxxxx
NPM_TOKEN=npm_xxxxxxxxxxxx
```
## Limitations
- Some GitHub-hosted runner features unavailable locally
- `${{ secrets.GITHUB_TOKEN }}` requires manual token
- Service containers need Docker Compose setup
- Large runner images (2-9GB) on first run
## Performance Target
**Target**: <2 minutes for typical test workflow
- Image pull (first run): 2-5 minutes
- Subsequent runs: <30 seconds startup
- Test execution: Depends on project
## Need More Detail?
**Load**: `skills/act-local-ci/REFERENCE.md` (~20KB)
- Advanced configuration options
- Service container setup
- Troubleshooting common issues
- Integration with ensemble agents
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