docker: uninstall build dependencies from runtime image

Author: 3np

Dockerfile

@@ -9,7 +9,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends gnupg ca-certif
   python3-pip=* python3=* \
   && pip3 config set global.break-system-packages true \
   && ./install.sh --docker-install \
-  && apt-get purge -y --autoremove python3-pip \
+  && apt-get purge -y --autoremove \
+    python3-pip python3-dev python3-pip \
+    automake build-essential cpp pkg-config libffi-dev libssl-dev \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/*