adding useful bash alias to dockerfile

configs/docker/build/Dockerfile

@@ -15,6 +15,8 @@ COPY ./conda-env-py3EWS-withbuilds.yml .
 #install system packages
 RUN apt-get update;apt-get install --assume-yes wget unzip emacs gdal-bin libgdal-dev build-essential gfortran zlib1g zlib1g-dev libbz2-dev apt-utils liblzma-dev libpcre++-dev libcurl4-openssl-dev default-jre lib32readline7 lib32readline6-dev openssh-server libfribidi-dev libfontconfig1-dev git;
 RUN echo "alias e='emacs -nw $1'" >> ~/.bashrc;
+RUN alias ll="ls -ltr"
+
 #sets the timezone to London
 RUN DEBIAN_FRONTEND=noninteractive TZ=Etc/UTC apt-get -y install tzdata