Use PGDATA rather than hard coded default path

docker-entrypoint.sh

@@ -579,15 +579,15 @@ _main() {
 				echo "------------------------"
 
 				# Get the list of databases in the database cluster
-				DB_LIST=$(echo 'SELECT datname FROM pg_catalog.pg_database WHERE datistemplate IS FALSE' | postgres --single -D /var/lib/postgresql/data 2>/dev/null | grep datname | grep -v backend | cut -d '"' -f 2)
+				DB_LIST=$(echo 'SELECT datname FROM pg_catalog.pg_database WHERE datistemplate IS FALSE' | postgres --single -D "${PGDATA}" 2>/dev/null | grep datname | grep -v backend | cut -d '"' -f 2)
 
 				# For each database, reindex it
 				for DATABASE in ${DB_LIST}; do
 					echo "-------------------------------"
 					echo "Starting reindex of ${DATABASE}"
 					echo "-------------------------------"
 
-					echo 'REINDEX DATABASE' | postgres --single -D /var/lib/postgresql/data "${DATABASE}"
+					echo 'REINDEX DATABASE' | postgres --single -D "${PGDATA}" "${DATABASE}"
 
 					echo "-------------------------------"
 					echo "Finished reindex of ${DATABASE}"