I initially copied logo.png to the wrong location. To fix this, I locate the correct path of the default image inside my Docker container and use it as a reference.

• Access the running docker image : $ docker exec -it <my container id>
• find the default logo file (superset-logo-horiz.png): $ find / -name "superset-logo-horiz.png"
• Use the result in the dockerfile: COPY logo.png /usr/local/lib/python3.10/site-packages/superset/static/assets/images/logo.png