User should not be root when the Dockerfile completes DOK-DL3002
Security
Critical
Switching to the root USER opens up certain security risks if an attacker gets access to the container. In order to mitigate this, switch back to a non privileged user after running the commands you need as root.
Bad Practice
FROM debian:buster
USER root
RUN ...
Recommended
FROM debian:buster
USER root
RUN ...
USER guest