FROM drupal:7 LABEL maintainer="Torben Nehmer " RUN set -ex; \ apt-get update; \ \ apt-get install -y --no-install-recommends \ msmtp \ ; \ \ rm -rf /var/lib/apt/lists/* ;\ apt-get clean # Finally, publish the rootfs file into the container # This is done as last step to make docker build caching more efficient. ADD rootfs.tar.gz /