I have two Rails applications (say app1 and app2) deployed using Nginx/Passenger. The server definition in nginx.conf looks like this:

server {
        rails_env demo;
        client_max_body_size 50M;
        listen       80;
        server_name  localhost;
        root /data/apps;
        passenger_enabled on;
        passenger_base_uri /app1;
        passenger_base_uri /app2;
    }

You can see that both are configured to use demo as the RAILS_ENV. How should I change my configuration to run both the apps in different environments. Let's assume app2 is suppose to run with RAILS_ENV=qa and app1 with RAILS_ENV=demo