Did you get this working?

Yes, although the owners of the repo wanted to make their own template to take advantage of the kickback program. However I haven't seen that made yet.

And there was a small change that they made to the port config on the main branch -- you may need to remove the PORT=5000 from the env vars and map that port manually in the railway editor.

I have a PR up for the postiz documentation on the env vars if you find that helpful:

https://github.com/gitroomhq/postiz-docs/pull/63