You're not looking at it right. The JSON document is your DB. Wanna add another client config? Your client manager makes a PR with the changes and your CI deploys it with the server binary. Easy peasy no-code solution.

If you have CI, that's still over-engineered for a pre-mvp product.

Just kidding... partially

I think CI is actually one that you should do when you write your first few lines of code. GitHub actions is free, comes with one click templates, so use it.