added nslookiup

basis/Dockerfile

@@ -5,7 +5,7 @@ LABEL maintainer "Eppelt, Jonas jonas.eppelt@kit.edu"
 USER root
 
 ### fixing timezone issues and make sure certificate lists are up to date
-RUN apt-get update && apt-get install -y tzdata curl
+RUN apt-get update && apt-get install -y tzdata curl nslookiup
 ENV TZ=Europe/Berlin
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone