Starting from Fider 0.13, it is now possible host custom Privacy Policy and Terms of Service that will be displayed to all users during the registration and sign in process.
You will need both documents written in a markdown format, they need to be named terms.md and privacy.md.
Fider's Docker image expects both file to be available on /app/etc. You can copy these files anywhere you want on your server and share them with your Docker container by using volumes.
For example, if your files are inside /home/me/fider, you can map it to the container with -v /home/me/fider:/app/etc.