TST: add PGPORT env var, rewrite setup_postgres.sh to scripts dir (#1932)

ci/scripts/setup_postgres.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+set -e
+
+if [ -z "${PGUSER}" ] || [ -z "${PGPORT}" ]; then
+    echo "Environment variables PGUSER and PGPORT must be set"
+    exit 1
+fi
+
+PGDATA=$(mktemp -d /tmp/postgres.XXXXXX)
+echo "Setting up PostgreSQL in ${PGDATA} on port ${PGPORT}"
+
+pg_ctl -D ${PGDATA} initdb
+pg_ctl -D ${PGDATA} start
+
+SOCKETPATH="/tmp/.s.PGSQL.${PGPORT}"
+echo -n 'waiting for postgres'
+while [ ! -e ${SOCKETPATH} ]; do
+    sleep 1
+    echo -n '.'
+done
+echo
+
+echo "Done setting up PostgreSQL. When finished, stop and cleanup using:"
+echo
+echo "    pg_ctl -D ${PGDATA} stop"
+echo "    rm -rf ${PGDATA}"
+echo
+
+createuser -U ${USER} -s ${PGUSER}
+createdb --owner=${PGUSER} test_geopandas
+psql -d test_geopandas -q -c "CREATE EXTENSION postgis"
+
+echo "PostGIS server ready."