Add Dockerfile to build GMTSAR Docker image

docker/gmtsar.Dockerfile

@@ -0,0 +1,61 @@
+# https://jupyter-docker-stacks.readthedocs.io/en/latest/using/selecting.html
+# https://github.com/jupyter/docker-stacks/blob/main/base-notebook/Dockerfile
+FROM ubuntu:22.04
+# unpack arbitrary files like to mans, etc.
+RUN yes | unminimize
+# fail on pipe errors
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+# install GMTSAR dependencies plus rsync
+RUN set -e \
+&&  apt-get -y update \
+&&  apt-get -y install git subversion curl rsync ghostscript \
+&&  apt-get -y install csh autoconf make gfortran \
+&&  apt-get -y install libtiff5-dev libhdf5-dev liblapack-dev libgmt-dev gmt-dcw gmt-gshhg gmt \
+&&  apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# define installation paths
+ARG GMTSAR=/usr/local/GMTSAR
+ARG ORBITS=/usr/local/orbits
+
+# install GMTSAR from git
+RUN set -e \
+&&  cd /usr/local \
+&&  git clone --branch master https://github.com/gmtsar/gmtsar GMTSAR
+RUN set -e \
+&&  cd ${GMTSAR} \
+&&  autoconf \
+&&  ./configure --with-orbits-dir=${ORBITS} CFLAGS='-z muldefs' LDFLAGS='-z muldefs' \
+&&  make \
+&&  make install
+
+# add script to download orbits by user
+RUN echo "#!/bin/sh"                                  > ${GMTSAR}/bin/download_orbits.sh
+RUN echo "# download orbit data for ERS and Envisat" >> ${GMTSAR}/bin/download_orbits.sh
+RUN echo "curl -O https://topex.ucsd.edu/gmtsar/tar/ORBITS.tar && sudo mkdir -p "$ORBITS" && sudo tar xf ORBITS.tar -C "$ORBITS" && rm ORBITS.tar" >> ${GMTSAR}/bin/download_orbits.sh
+# set execution permissions to the script
+RUN chmod a+x ${GMTSAR}/bin/download_orbits.sh
+
+# install packages required to user work in terminal
+RUN set -e \
+&&  apt-get -y update \
+&&  apt-get -y upgrade \
+&&  apt-get install -y vim nano perl wget tar zip man sudo adduser w3m chafa mc htop \
+&&  apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# allow ImageMagick to process PDF (required for chafa)
+RUN sed -i 's/rights="none" pattern="PDF"/rights="read | write" pattern="PDF"/' /etc/ImageMagick-*/policy.xml
+
+# create unprivileged user
+RUN set -e \
+&&  useradd --create-home --shell /bin/bash ubuntu \
+&&  usermod -aG sudo ubuntu \
+&&  echo "ubuntu ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/ubuntu \
+&&  chmod 044 /etc/sudoers.d/ubuntu
+
+# open terminal for the unprivileged user
+USER ubuntu:ubuntu
+WORKDIR /home/ubuntu
+# define binaries search path for unprivileged user only
+ENV PATH=${GMTSAR}/bin:$PATH
+CMD ["/bin/bash"]