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How should ref be configured for merge_group and pull_request builds?

Since TurboSnap does not support the pull_request event, you’ll need to make sure the ref in your checkout step is updated so Chromatic detects the correct git information. If you are triggering builds with both the pull_request and merge_group events, you’ll want to make sure both github.event.pull_request.head.ref and github.sha are set as the ref. This ensures your ref is correct for both events, with merge_group falling back to github.sha.

Here’s an example of the checkout step:

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: ${{ github.event.pull_request.head.ref || github.sha }}

It’s important to make sure both are set, as pull_request.head.ref does not exist for merge_group and does not implicitly fall back to github.sha.