[dockerfile] add comment

Author: amin1377

Dockerfile

@@ -5,6 +5,8 @@ ENV WORKSPACE=/workspace
 RUN mkdir -p ${WORKSPACE}
 WORKDIR ${WORKSPACE}
 COPY . ${WORKSPACE}
+# Required to bypass Python's protection on system-wide package installations in Ubuntu 23.04+.
+# This allows pip to install packages globally without using a virtual environment.
 ENV PIP_BREAK_SYSTEM_PACKAGES=1
 # Install and cleanup is done in one command to minimize the build cache size
 RUN apt-get update -qq \
@@ -30,4 +32,4 @@ RUN apt-get update -qq \
 # Build VTR
 RUN rm -rf build && make -j$(nproc) && make install
 # Container's default launch command
-SHELL ["/bin/bash", "-c"]
+SHELL ["/bin/bash", "-c"]