Mathesar maintainer here, this is awesome, but there are a few issues with this template:

1. There needs to be a PORT=8000 environment variable set, otherwise Mathesar isn't exposed to the network by default. This is confusing because it appears broken to users after installation.

2. The ALLOWED_HOSTS environment variable is *, a better default would likely be something like ${{RAILWAY_PUBLIC_DOMAIN}},${{RAILWAY_PRIVATE_DOMAIN}}

How does ownership of these templates work? Are they open source? Is there a license? The Mathesar team would be happy to contribute and maintain this integration if possible.