I don't use cloudron and I only commented as when I was looking for the specific cloudflare error:

The service may be down or it may not be responding to traffic from cloudflared: x509: certificate is not valid for any names, but wanted to match localhost" cfRay=6957204cbdeb1fb9-SJC ingressRule=0 originService=https://localhost

I landed here from Google and I know that in the future, I will probably have this issue again and forget the solution.
So I'm posting this more for future me.

However, this would solve that specific issue that @girish was having,

I got my services up and going that used a self signed ssl cert and was able to proxy it with cloudflare.

It would be cool to try cloudron as it sounds like a really great product, but I personally don't have the budget for it at the moment.