Make force_ssl.sh more robust

Starting with PG 18, PGDATA points to /var/lib/postgresql/MAJOR/docker
docker-library/postgres#1259

Using the environment variable, the script works with all DB versions.

Signed-off-by: Thomas Segismont <tsegismont@gmail.com>

Author: tsegismont

vertx-pg-client/src/test/resources/tls/force_ssl.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 
 # force ssl
-cp /tmp/pg_hba.conf /var/lib/postgresql/data/pg_hba.conf
+cp /tmp/pg_hba.conf ${PGDATA}/pg_hba.conf