v1.1: Merge pull request #2 from cpunion/ci

Usage

steps:
  # Install latest version (default)
  - uses: cpunion/setup-docker-compose@v1
    id: docker-compose

Features

• Cross-platform support (Linux, macOS, Windows)
• Automatically installs latest version by default
• Configurable version if needed
• Automatic architecture detection
• Checksum verification for secure downloads
• Adds Docker Compose to system PATH
• Outputs installed version for use in subsequent steps