Remove apt repository list and custom scripts from Dockerfiles

Author: jgaucher-cs

.github/dask-gateway/Dockerfile

@@ -72,6 +72,9 @@ RUN [ -f /opt/post-install-${IMAGE2BUILD}.sh ] && /opt/post-install-${IMAGE2BUIL
 
 RUN apt autoremove -y gcc && layer-cleanup.sh
 
+# Remove apt repository list and custom scripts
+RUN rm -f /etc/apt/sources.list /usr/local/bin/layer-cleanup.sh /usr/local/bin/restore-apt.sh
+
 # Add a default user
 RUN useradd -m user
 USER user

.github/dask-gateway/Dockerfile.mockup

@@ -85,6 +85,9 @@ RUN pip install opentelemetry-distro opentelemetry-exporter-otlp opentelemetry-i
 
 RUN apt update && apt install -y python3-pydot graphviz && layer-cleanup.sh
 
+# Remove apt repository list and custom scripts
+RUN rm -f /etc/apt/sources.list /usr/local/bin/layer-cleanup.sh /usr/local/bin/restore-apt.sh
+
 # Add a default user
 RUN useradd -m user
 

.github/jupyter/Dockerfile

@@ -99,6 +99,9 @@ COPY --chown=rspy:rspy ./resources/jupyter_server_config.py /tmp/jupyter_server_
 COPY resources/start-notebook.sh /usr/local/bin/
 RUN chmod 755 /usr/local/bin/start-notebook.sh
 
+# Remove apt repository list and custom scripts
+RUN rm -f /etc/apt/sources.list /usr/local/bin/layer-cleanup.sh /usr/local/bin/restore-apt.sh
+
 ENTRYPOINT ["start-notebook.sh"]
 
 EXPOSE 8888