Tool exits with "Could not find queued run."

### Describe the Bug

backfill-cdp-instance fails after invoking command to backfill.

### Expected Behavior

backfill-cdp-instance should "stay alive" and queue a new workflow when the current workflow finishes.

### Reproduction

Verify `$GITHUB_TOKEN` is present in environment.

```bash
backfill-cdp-instance OpenMontana montana-legislature-council-data-project 2023-03-17T00:00:00 2023-03-18T23:59:59 --outfile mtleg_backfill.log --iter_days 1 --overlap_days 0
```

### Environment

- python: Python 3.10.9
- OS Version: macOS 13.3.1 (a) (22E772610a)
- cdp-gh-utils Version: 0.2.0