Unable to write report files when using Docker image

Using the latest Docker image (sha256:bbb14e858024cb6ea3aca101aa7694ebf278aa9deca45677f7ae91bb291e01de), I am unable to write report files (--html/--html-dir) inside the container. When specifying --html, I can use - to write the report to STDOUT but no such luck with --html-dir.

I was able work around this by creating a volume (docker volume create diffoscope-reports) and then mounting that over user's home directory docker run ... -v diffoscope-reports:/home/user ...

I see three possible fixes:

1. Revert the change that added the USER directive
2. Document the use of mounting a volume at /home/user to pass report files out of the container
3. Add the volume creating to the Dockerfile itself

Option 1 seems to be consider not a best practice for container images, while option 2 seems to be the lowest risk change but inconvient. I like option 3 but wanted to get input from others.