After the rasa-sdk version 1.8.0 docker image uses UID 1001 instead of root. To install anything you can switch to root user and switch back at the end of the your dockerfile.
add USER root in your Dockerfile
Look at my comment here
After the rasa-sdk version 1.8.0 docker image uses UID 1001 instead of root. To install anything you can switch to root user and switch back at the end of the your dockerfile.
add USER root in your Dockerfile
Look at my comment here