Fix Mongo (#6152)

toolset/databases/mongodb/mongodb.dockerfile

@@ -5,6 +5,8 @@ COPY ./ ./
 RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 4B7C549A058F8B6B
 RUN echo "deb https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.2 multiverse" | tee /etc/apt/sources.list.d/mongodb-org.list
 RUN apt-get -yqq update > /dev/null
+# Complete and utter hax if works
+RUN ln -s /bin/echo /bin/systemctl
 RUN DEBIAN_FRONTEND=noninteractive apt-get -yqq install apt-transport-https mongodb-org > /dev/null
 
 RUN mkdir -p /data/db