It’s a Bitnami instance on AWS. The SSL is set up using Bitcert (a Bitnami tool setting up Let’s Encrypt) (sudo /opt/bitnami/bncert-tool)
Which brings us to another problem I’m having. If I change the url in config.production.json to https, the whole site stops working. I’m redirected to an IP that is 127.0.0.1 and/or get an infinite redirection resulting in an error loading the site. I’m having the same problem as this guy here.