The correct option is JavaScript actions execute directly on the runner so they usually start faster and keep action code simple.

This choice runs on the host runner without starting a container which reduces startup time and keeps setup minimal. It also works across Ubuntu, macOS, and Windows runners because it relies on the Node.js runtime that GitHub provides, so it fits the team’s need for quick execution and portability.

Docker container actions ensure a consistent environment across operating systems which can increase reliability is not the right benefit for this scenario because container actions add image pull and container startup overhead and they can only run on Linux runners, so they do not meet the cross platform requirement.

Cloud Build is unrelated to choosing between JavaScript and Docker actions in GitHub Actions and does not address the workflow step startup or cross platform simplicity the team needs.

Docker container actions provide stronger isolation and security boundaries than JavaScript actions does not match the primary requirement for faster startup and simple cross platform use, and container actions cannot run on macOS or Windows runners, which makes them a poor fit here.

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