The /list blueprint is the responsible for the request to Craftbeerpi original plugins.yaml file

Clone the the repo https://github.com/Manuel83/craftbeerpi-plugins, on your clone include new records to the plugins you want on the file plugins.yaml:

Each Plugin needs:

UniquePluginName:
description: Description of the plugin that will showed at the plugin screen
api: 3.0
author: Your name repo_url: https://github.com/YourRepo/YourPluginCode.git

This way you can combine the original list with the original urls allowing you to update your plugins and including your own.
YOU will never see new records from original Craftbeerpi repository. But you may watch the original one and see when it changes.

If you wanto to combine the original ones plus the ones on your repository I have created a Craftbeerpi plugin to it: https://github.com/MarcioMonego/ChangePluginsRepository There you can find instructions on how to proced.