Summary

Add GitHub Actions outputs for reviewers and assignees so that subsequent workflow steps can use this information.

Use Case

Users can pass the assigned reviewers/assignees to other actions, such as Slack notifications:

- uses: kentaro-m/auto-assign-action@v2
  id: assign

- uses: slackapi/slack-github-action@v1
  with:
    payload: |
      {"text": "Reviewers assigned: ${{ steps.assign.outputs.reviewers }}"}

Proposed Outputs

Implementation

Add core.setOutput() calls in handler.ts after successful assignment.

Also update action.yml to document the outputs.