Add lftpg

base/singularity:3.1

 FROM debian:stretch
   MAINTAINER Kay Graf <kay.graf@km3net.de>
 #Install Singularity as described on https://github.com/sylabs/singularity/blob/master/INSTALL.md
-  RUN apt-get update -qq && apt-get install -qq -y wget bzip2 python-pip git zsh 
+  RUN apt-get update -qq && apt-get install -qq -y wget bzip2 python-pip git zsh lftp
   RUN apt-get install -qq -y build-essential libssl-dev uuid-dev libgpgme11-dev libseccomp-dev pkg-config squashfs-tools 
   RUN export VERSION=1.11.4 OS=linux ARCH=amd64 && wget -q -O /tmp/go${VERSION}.${OS}-${ARCH}.tar.gz https://dl.google.com/go/go${VERSION}.${OS}-${ARCH}.tar.gz && \ 
  tar -C /usr/local -xzf /tmp/go${VERSION}.${OS}-${ARCH}.tar.gz
@@ -24,4 +24,4 @@ FROM debian:stretch
  source /usr/local/bin/ulib.sh\n\
  fi\n'\
      >> /etc/zsh/zshenv
- CMD ["/bin/zsh"]
\ No newline at end of file
+ CMD ["/bin/zsh"]