setup-docker

A GitHub Action to set up Docker on GitHub-hosted runners for Linux, macOS, or Windows.

• All GitHub-hosted Linux runners, including ubuntu-latest, have Docker installed and configured already. On Linux, this action has no effect.
• GitHub's macOS and Windows runners do not have Docker installed or fully configured. On these platforms, we install Podman as the backend.
• On macOS, this works only on the Intel-based runner, macos-13. It does not work on Apple Silicon runners (macos-14, macos-15) because nested virtualization does not work.
• On Windows, this works on windows-2022, windows-2025, and windows-latest, but not on windows-2019.