Great to see bookworm beeing finally released

However I've used ImageBakery to customize my images.
Where can I find the bookworm build there?
I did not yet find a release tag there.

I've used rpiboot to get access to the storage of a revpi and flash an image.

How can I restart the PI from the terminal, so it boots into the freshly flashed OS?

I do not want to physically interact with the raspberry (e.g. reconnect the powersupply), so it can be restarted via a script.