Unfortunately, Discourse does not support this following the standard approach, so an edit of the template files is required.
In order to get the logo at the top, and first of all, you will need to create a new style in your Discourse Admin (Customize > CSS/HTML), and add the following CSS customization:
After that, it will be necessary to modify the following file:
You will have to add this line (before the line
<li><a class="icon" href="https://mysite.com" title="Go to mysite.com" target="_blank"><i class="icon-mysite"> </i></a></li>
Once that is done, you have to load the Bitnami environment to be able to execute commands inside Discourse:
Once that is done, you will be able to precompile assets:
RAILS_ENV=production bundle exec rake assets:precompile
You might also need to do a restart of your Discourse servers:
sudo /opt/bitnami/ctlscript.sh restart
I hope it works!