Dockerfile: Add a user for OpenMPI (#257)

OpenMPI does not like to be run as root.

Dockerfile

@@ -1,20 +1,24 @@
-FROM ubuntu:latest
+FROM ubuntu:18.04
 MAINTAINER Shaun Jackman <sjackman@gmail.com>
 
 RUN apt-get update \
 	&& apt-get install -y --no-install-recommends \
-		bsdmainutils libgomp1 make openmpi-bin ssh
+		bsdmainutils libgomp1 make openmpi-bin ssh sudo \
+	&& useradd -m -s /bin/bash abyss \
+	&& echo 'abyss ALL=(ALL) NOPASSWD:ALL' >>/etc/sudoers
 ADD . /tmp/abyss
 RUN apt-get install -y --no-install-recommends \
 		automake g++ libboost-dev libopenmpi-dev libsparsehash-dev \
 	&& cd /tmp/abyss \
 	&& ./autogen.sh \
 	&& mkdir build && cd build \
-	&& ../configure --with-mpi=/usr/lib/openmpi \
+	&& ../configure --with-mpi=/usr/lib/x86_64-linux-gnu/openmpi \
 	&& make install-strip \
 	&& rm -rf /tmp/abyss \
 	&& apt-get autoremove -y binutils \
 		automake g++ libboost-dev libopenmpi-dev libsparsehash-dev
-ENV SHELL=/bin/bash
+USER abyss
+WORKDIR /home/abyss
+ENV SHELL=/bin/bash USER=abyss
 ENTRYPOINT ["abyss-pe"]
 CMD ["help"]