aarch64: create and use a virtual environment for Python packages

docker/Dockerfile_aarch64

@@ -58,14 +58,18 @@ RUN apt-get update && apt-get -y --quiet --no-install-recommends install \
 	&& apt-get clean autoclean \
 	&& rm -rf /var/lib/apt/lists/{apt,dpkg,cache,log} /tmp/* /var/tmp/*
 
-# Install Python 3 pip build dependencies first.
+# Set Python 3 as the default version
 RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 10
-RUN pip3 install wheel setuptools
+
+# Create a virtual environment for Python packages
+RUN python3 -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
 
 # Python 3 dependencies installed by pip
-RUN pip3 install argparse argcomplete coverage cerberus empy==3.3.4 jinja2 kconfiglib \
-		matplotlib==3.0.* numpy packaging pkgconfig pyros-genmsg pyulog \
-		pyyaml requests serial six toml psutil pyulog wheel jsonschema
+RUN pip3 install argparse argcomplete coverage cerberus empy==3.3.4 jinja2 \
+		kconfiglib matplotlib==3.0.* numpy packaging pkgconfig pyros-genmsg \
+		pyulog pyyaml requests setuptools serial six toml psutil pyulog wheel \
+		jsonschema
 
 # astyle v3.1
 RUN wget -q https://downloads.sourceforge.net/project/astyle/astyle/astyle%203.1/astyle_3.1_linux.tar.gz -O /tmp/astyle.tar.gz \