The link my colleague provided will help you in a way that, whenever some enters NAMEHERE.bitnamiapp.com they will be redirected to
https://NAMEHERE.bitnami.app, no matter if he even specified the http protocol. By looking at your initial request, this is what you expect, no?
And, of course, you can enable SSL to prefixes.
should be added to
/opt/bitnami/apps/redmine/conf/httpd-app.conf, who is referenced by
Let us know if we can help you with anything else.