Add less to development container

projects/docker/Dockerfile

@@ -64,7 +64,7 @@ ARG ADD_DEV
 RUN set -e pipefail; \
     if test xYES = x`echo ${ADD_DEV} | tr '[:lower:]' '[:upper:]'`; then \
       apt-get update -y; \
-      apt-get install -y emacs; \
+      apt-get install -y emacs less; \
       pip install pylint black; \
       apt-get purge -y --auto-remove pip; \
     fi