Set timezone in Ubuntu docker container

Dockerfile

FROM ubuntu:20.04
 
# Set TZ to Asia/Jerusalem
# For valid combinations, run 'dpkg-reconfigure -f noninteractive tzdata'
RUN export DEBIAN_FRONTEND=noninteractive \
      && export DEBCONF_NONINTERACTIVE_SEEN=true \
      && echo 'tzdata tzdata/Areas select Asia' | debconf-set-selections \
      && echo 'tzdata tzdata/Zones/Asia select Jerusalem' | debconf-set-selections \
      && apt-get update -y \
      && apt-get install -y --no-install-recommends tzdata