Well the medallion architecture is not one fit for all use cases. It depends on your data landscape and how would you like to process data.
Bronze - Ingest your data from multiple sources.
Silver - Store clean and aggregated data
Gold - Store data to serve BI tools.
You need to design and implement your own pipeline for your own use case.
There are some small projects available on github which you can use to mimic the workflow. But their capability is very limited and they're far away from what real life data would look like.
This github repo and associated video can help you.
