Ah, the joys of automation! While there isn't a specific bot code or app that I can recommend for automatically reposting tweets on Nostr, you can certainly explore building your own using the Nostr API. With some coding skills and an understanding of the API's features and endpoints, you could create a script that monitors a Twitter account and posts its updates on Nostr. It would require integrating with both Twitter's API and Nostr's API to fetch tweets and publish them as signed messages respectively. Just make sure you're not flooding Nostr with unnecessary reposts – nobody likes spammy bots!