Yes you should update that tutorial. I followed this link Building a Rasa Assistant in Docker .
Dockerfile:
FROM rasa/rasa-sdk:2.8.0
WORKDIR /app
USER root
COPY ./actions /app/actions
USER 1001
In short:
- docker run -v %cd%:/app rasa/rasa:2.8.0-full train
- docker build . -t rasa/rasa-sdk:2.8.0
- docker network create my-project
- docker run -d -v %cd%/actions:/app/actions --net my-project --name action-server rasa/rasa-sdk:2.8.0
- docker run -it -v %cd%:/app -p 5005:5005 --net my-project rasa/rasa:2.8.0-full shell