I am deploying a second Rails app using Kamal 2. I already have one private app on Docker Hub's free tier. I have a question. Regarding Docker Hub: If I were to use it, do I need to manually create the repository on the website first, or does Kamal automatically create it when I set image: username/app and add my token to .kamal/secrets? And this should be free or should I update to a paid docker vesion? And are we sure that we should add our docker hub username to begin with?