Ignore pip's root user warning

Author: hugovk

Dockerfile

@@ -8,6 +8,7 @@ ENV PYTHONDONTWRITEBYTECODE 1
 ENV PYTHONUNBUFFERED 1
 
 ENV PIP_NO_CACHE_DIR 1
+ENV PIP_ROOT_USER_ACTION ignore
 
 ENV PATH "/root/.local/bin:${PATH}"
 ENV PYTHONPATH "/root/.local/lib/python3.11/site-packages"