-RUN apt update && apt -y upgrade
-
-RUN apt install -y sudo && \
- groupadd -g 999 user && \
- useradd -r -u 999 -g user user && \
- echo "user ALL=(root) NOPASSWD:ALL" > /etc/sudoers.d/user && \
- chmod 0440 /etc/sudoers.d/user && \
- mkdir -p /home/user && \
- chown -R user:user /home/user
+# https://stackoverflow.com/questions/35134713/disable-cache-for-specific-run-commands
+ADD "http://deb.debian.org/debian/dists/testing/Release" skipcache
+RUN apt update && apt -y upgrade