Add 32-bit test container to test fixes for #411

bin/test-32-bit

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+#!/bin/bash
+
+cd "$(dirname "${BASH_SOURCE[0]}")"
+cd ..
+exec ./containers/32-bit/run bash -c \
+     'cd skyfield && ls && assay --batch skyfield/tests'

containers/32-bit/Dockerfile

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+FROM 32bit/ubuntu:16.04
+RUN apt update
+RUN apt install -y -y build-essential python3-dev
+RUN apt install -y -y python3-pip
+RUN pip3 install numpy==1.11.3
+RUN pip3 install argparse certifi jplephem mock pytz sgp4 unittest2
+RUN pip3 install https://github.com/brandon-rhodes/assay/archive/master.zip
+RUN echo 'PYTHONPATH=.. assay --batch skyfield.tests' > /root/.bash_history
+CMD cd skyfield/ci && /bin/bash

containers/32-bit/run

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+#!/bin/bash
+
+set -ex
+CONTAINER_NAME=skyfield-python-2.6
+
+if [ ! -f /usr/bin/docker ]
+then
+    echo Error: please apt install docker.io >&2
+    exit 2
+fi
+
+cd "$(dirname $0)"
+
+docker build -t $CONTAINER_NAME . 1>&2
+
+#     -v $PWD/../../../assay:/assay \
+exec docker run -ti \
+     -v $PWD/../..:/skyfield \
+     $CONTAINER_NAME "$@"