Fix for elasticbeanstalk puma and serving of static files from the public folder

.ebextensions__02_nginx_fix.config

---
container_commands:
  10_copy:
    command: sudo cp -f config/nginx.conf /etc/nginx/conf.d/webapp.conf
  20_reload:
    command: sudo service nginx reload

config__nginx.conf

upstream my_app {
  server unix:///var/run/puma/my_app.sock;
}

server {
  listen 80;
  server_name _ localhost; # need to listen to localhost for worker tier

  root /var/app/current/public;

  location / {
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    if (!-f $request_filename) {
      proxy_pass http://my_app; # match the name of upstream directive which is defined above
      break;
    }

    gzip_static on;
    gzip on;
    expires max;
    add_header Cache-Control public;
  }
}