[Python] Why do I still get a warning about "Running pip as the 'root' user" inside a Docker...

I made a simple image of my python Django app in Docker, using this Dockerfile:

FROM python:3.8-slim-buster

WORKDIR /app
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
COPY . .
CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]


And building it using:

sudo docker build -t my_app:1 .


But after building the container (on Ubuntu 20.04) I get this warning:

WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead


Why does it throw this warning if I am installing Python requirements inside my image? Can I actually break my system this way?

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