Question

You are authoring a JavaScript action that starts a background proxy process during the main step and must ensure the proxy is always terminated after the job finishes, even if a later step in the workflow fails. You want this cleanup logic to run automatically without requiring consumers to add a separate step. Which action.yml configuration achieves this?

Accepted Answer

Add a `post:` key under `runs:` pointing to a cleanup script (e.g., `cleanup.js`) alongside `main:`

Answer

Set `runs.using: composite` and add a final `run:` step with `if: always()` that kills the proxy

Answer

Add a `pre:` key under `runs:` that registers a trap to kill the process on job completion

Answer

Define a `cleanup:` job in the action.yml that GitHub schedules after the caller's job