ARG IMAGE
FROM $IMAGE
ARG TZ=Europe/London

USER root
RUN if [ ! -f /usr/share/zoneinfo/$TZ ]; then apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y tzdata; fi \
 && ln -sf /usr/share/zoneinfo/$TZ /etc/localtime  \
 && echo $TZ > /etc/timezone