Add Dockerfile for Selen

docker/selen/Dockerfile

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+FROM geodynamics/selen-buildenv-bionic:latest
+
+RUN apt update && \
+  DEBIAN_FRONTEND='noninteractive' \
+  DEBCONF_NONINTERACTIVE_SEEN='true' \
+  apt install --yes \
+  git
+
+RUN useradd \
+  --create-home \
+  selen_user
+
+USER selen_user
+
+WORKDIR /home/selen_user
+
+RUN git clone 'https://github.com/geodynamics/selen.git';
+
+RUN cd selen/DATA; gunzip *.gz;
+
+RUN cd selen/src; make;
+
+ENV PATH="/home/selen_user/selen:${PATH}"

docker/selen/readme.md

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+This container hosts a built version of selen.
+
+docker run -it --rm -v $HOME/selen:/home/selen_user/work geodynamics/selen
+
+This command will start the selen docker image and give you terminal access. Any changes made in the /home/selen_user/work directory will be reflected on the host machine at home/selen.