Hi @michaelpolla,
Thanks for your feedback,
Here are a couple of places you might find help for your issue:
- [SOLVED] How to use Lets Encrypt with the Docker Image of Mattermost
- https://wiki.archlinux.org/index.php/Mattermost#With_Docker
- https://programmingflow.com/2016/11/24/setting-up-your-own-private-and-secure-chat.html
- https://libraries.io/github/mattermost/mattermost-docker
Let me know if any of the above help 