Local docker install results in 404 or empty white page

Hello, I'm interested in using Loomio for a self hosting community project. I'm planning to host it on a VPS using docker-compose and the edge router traefik. All directly set up using as few files as possible and a single .env file for host specific settings.

I used https://github.com/loomio/loomio-deploy as a starting point and created my own docker-compose setup.

Sadly I seem to be missing some essential configuration and I cannot figure out what. The services start properly but the start page only returns a 404, and any other page is empty white. I cannot find any sort of log anywhere from the ruby application.

Here is the setup I'm using: https://github.com/exstral/loomio-traefik

Since I'm using traefik I've skipped the nginx container used in loomio-deploy. As far as I can see nginx is not need for serving any static files and is only used to route the http traffic to the correct container. The app container should be able to serve all dynamic and static files required, correct?

What should the start page display in a working loomio install? Is there some default login page with a default admin user? Is it possible to enable debug logging for the ruby app?