add a script to run the test for online-advisor as a regular user. (#12017)

## Problem
The regression test for the extension online_advisor fails on the
staging instance due to a lack of permission to alter the database.
## Summary of changes
A script was added to work around this problem.

---------

Co-authored-by: Alexander Lakhin <alexander.lakhin@neon.tech>

docker-compose/ext-src/online_advisor-src/neon-test.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+set -ex
+cd "$(dirname "${0}")"
+if [ -f Makefile ]; then
+  make installcheck
+fi

docker-compose/ext-src/online_advisor-src/regular-test.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -ex
+cd "$(dirname ${0})"
+[ -f Makefile ] || exit 0
+dropdb --if-exist contrib_regression
+createdb contrib_regression
+PG_REGRESS=$(dirname "$(pg_config --pgxs)")/../test/regress/pg_regress
+TESTS=$(echo sql/* | sed 's|sql/||g; s|\.sql||g')
+${PG_REGRESS} --use-existing --inputdir=./ --bindir='/usr/local/pgsql/bin' --dbname=contrib_regression ${TESTS}