Fix builder Dockerfile python install

Author: Neil Horne

builder/Dockerfile

@@ -17,18 +17,22 @@ RUN apt-get update && \
         wget \
         python3-pip \
         gawk && \
-    rm -rf /var/lib/apt/lists/*
+    apt-get clean && rm -rf /var/lib/apt/lists/*
 
 RUN wget --quiet https://developer.arm.com/-/media/Files/downloads/gnu/14.2.rel1/binrel/arm-gnu-toolchain-14.2.rel1-x86_64-arm-none-eabi.tar.xz -O - \
         | tar -xJ -C /opt
 
-RUN python3 -m pip install -U pip setuptools \
-    && python3 -m pip install \
-    asciitree \
-    jinja2 \
-    pillow \
-    lz4 \
-    pyelftools
+# Python 3.11 introduced the managed environment breakage aka PEP 668.
+# since we are building a self-contained environment the simple fix is to add --break-system-packages to all pip installs
+RUN python3 -m pip install -U setuptools && \
+    python3 -m pip install \
+        asciitree \
+        jinja2 \
+        pillow \
+        lz4 \
+        pyelftools && \
+    # Clean pip cache
+    python3 -m pip cache purge
 
 # work-around for datacopy build script in 2.8.5
 RUN ln -s /usr/lib/x86_64-linux-gnu/libclang-14.so.14.0.0 /usr/lib/libclang-14.so && \