Started building Docker test environment

Dockerfile

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+# TODO: make version variable?
+FROM postgres:9.6
+
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    postgresql-server-dev-9.6 \
+    libphonenumber6 \
+    sudo
+
+CMD ["/data/run-tests.sh"]
+
+COPY ./ /data/
+RUN chown -R postgres:postgres /data/
+
+# Patch the entrypoint script so it always initializes the DB.
+RUN patch /usr/local/bin/docker-entrypoint.sh < /data/docker-entrypoint.patch
+
+WORKDIR /data
+RUN make && make install

docker-entrypoint.patch

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+32c32,33
+< if [ "$1" = 'postgres' ] && [ "$(id -u)" = '0' ]; then
+---
+> #if [ "$1" = 'postgres' ] && [ "$(id -u)" = '0' ]; then
+> if [ "$(id -u)" = '0' ]; then
+44c45
+< if [ "$1" = 'postgres' ]; then
+---
+> #if [ "$1" = 'postgres' ]; then
+130c131
+< fi
+---
+> #fi

run-tests.sh

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+#!/bin/sh
+PGDATA=/var/lib/postgresql/data
+# TODO: don't hard-code version here.
+pg_ctl=/usr/lib/postgresql/9.6/bin/pg_ctl
+gosu postgres $pg_ctl "--pgdata=$PGDATA" start -w
+gosu postgres make installcheck
+gosu postgres $pg_ctl "--pgdata=$PGDATA" stop
+