That’s what I’m saying. I can use nginx/caddy/whatever to proxy specific paths just the same, with a single server instance. Some of my static sites are even protected by SSO, with a shared auth endpoint proxied by nginx. Proxying wasn’t invented after containers after all, that’s basically an orthogonal concern here.

Sure, your way of solving this is great.

That doesn't mean that a container-based Caddy solution in an existing container-based deployment environment built around Coolify isn't a reasonable way to solve this.