act Local GitHub Actions Runner

act is an open-source CLI tool that runs GitHub Actions workflows locally using Docker, enabling fast feedback on workflow changes without pushing to GitHub. It is a standard tool for local Actions development and testing.

Installation

Use the upstream install or setup path that matches your environment:

• Install Docker first. On macOS, use Docker Desktop. On Linux, install Docker Engine.
• On macOS, install act with Homebrew: `brew install act`
• git clone https://github.com/nektos/act.git
• make build

Requirements and caveats from upstream:

• act depends on the Docker Engine API to run workflows in containers.
• Jobs that do not require container isolation can be run directly on the host runner when that fits the workflow.

Basic usage or getting-started notes:

• Run all local workflow jobs: `act`
• Run a specific job: `act -j `