Clean apt packages/cache after build

This commit adds in a step at the end of the development Dockerfile to
clean the apt repositories/cache/unused packages from the image to make
it a little bit smaller and more production like. This isn't super
necessary for a development image that likely won't leave the machine
it's built on, but this is best practice and is barely noticeable in
terms of image build time.

Author: boomanaiden154

experimental/docker/development.Dockerfile

@@ -42,5 +42,8 @@ RUN ./build_tflite.sh
 COPY . /ml-compiler-opt
 WORKDIR /ml-compiler-opt
 RUN pip3 install pipenv && pipenv sync --categories "packages dev-packages ci" --system && pipenv --clear
+RUN apt-get autoremove -y --purge \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
 WORKDIR /