Open sourcing my project

I’m open sourcing my project, which in short is a chat app and I’m looking for some clarity on a few things. This is my first time doing so.

I have a nextjs project using mongodb realm-web app services where I have my database and my serverless functions. To contribute and develop locally on the project you would need to of course connect to the database to create a user, create a chat, delete chat, update chats etc…

My question is how I should go about this?
I can’t just let everybody fork the project with my App service app-id and use the public production database to perform CRUD methods and then have the power to delete all users and chats.

How do you guys normally do this?
It doesn’t seem like there is an easy way to just clone the current database and then just use that one as a dummy one.