Staging and Production on same VPS

More on the original post topic - I’d like to have staging and production on one DO droplet (on the basis that the staging site will be hidden to all except clients and project staff, so usage/bandwidth/resource usage will be limited).

I have my folders setup identically to the trellis example project - but when I provision and deploy, the staging and production site seem to conflict with each other. It looks as though Nginx only ever has one ‘site-name.conf’, but is there a way to alter the group_vars so that both can co-exist?

Thanks!