When I built a new UI package how can I run it on production?

Do you mean you made changes to rancher/dashboard, built them and would now like to use them in an instance of rancher? If so, you need to host the build artifacts somewhere and then you can change the url rancher uses to serve those artifacts.

No, I built a package like that https://github.com/rancher/ui-plugin-examples/tree/main/pkg/clock And I want to add it to my production rancher server

Alright, for extensions the only way we support adding them to a production server is through adding the git repo as mentined in the top of the readme here https://github.com/rancher/ui-plugin-examples. It does require that you build the helm chart which I don't see docs for yet. If you have the patience to figure it out you can use our publish script https://github.com/rancher/ui-plugin-examples/blob/main/scripts/publish otherwise I'll update here once we have the docs.

Thank you for information!