Just a note for anyone that is trying to get Wallabag - I have finally had some luck with the official docker repository getting setup on unRAID.
https://hub.docker.com/r/wallabag/wallabag/
For smaller installs, the basic version running on SQLite is quite nice. However, configuring it for me took some learning.
When importing the container through CA, I mapped two different locations which were noted on the dockerfile:
/var/www/wallabag/data was mapped to /mnt/user/appdata/wallabag/data
Also /var/www/wallabag/web/assets/images was mapped to /mnt/user/appdata/wallabag/data
Then I had CA create the container.
Finally, I came up to a huge hurdle with the initial release of Wallabag 2.3.1 - it kept loading with no CSS - essentially unformatted text only on the screen. It turns out that they may have made a mistake in how your individual URL for Wallabag gets populated in the screen. So, I noticed that you can set that variable by editing the container.
In the Wallabag container, click "Advanced Options", then in the "extra parameters" section, I added this line as it was mentioned in the Repo Info:
-e SYMFONY__ENV__DOMAIN_NAME=https://my.wallabag.url
As I'm using Wallabag behind a reverse proxy, I found that I needed my domain/name rather than IP address in that new parameter. Additionally, I had to change the "WebUI" to match the same address.
Finally, it worked! Official Wallabag repo on unRAID, all nice and pretty.
A little note of caution here as this post may exist for awhile, I totally feel like the DOMAIN_NAME issue is a simple mistake as the current docker build is only 8 days old as of this post. Changing that may not be a requirement in the future, but having to work around it was a great learning experience!