Metabase timeout configuration

@flamber what is the recommended method for setting the nginx timeouts when using AWS Elastic Beanstalk (the recommended platform)? I’ve increased the load balancer timeout to 4000 and verified the timeout is coming from nginx. I’ve SSH’d into the app instance and added the increased timeout config myself to get it working, but this will be overwritten as soon as the system updates. The methods for permanently setting the nginx config all seem to require changes to the code repo.