openresty lua sample docker

openresty.md

use openresty/openresty:alpine as a base image it has an /etc/nginx/conf.d/ dir

    location /lua {                                                                                    
      content_by_lua '                                                                                 
        ngx.say("hello from lua")                                                                      
        ngx.say("host: ", os.getenv("HOSTNAME"))                                                       
      ';                                                                                               
    }                                                                                                  

to propagate env vars, add env directive to the main context of /usr/local/openresty/nginx/conf/nginx.conf

env HOSTNAME;
env PATH;