openstack-base: Fix psycopg2 install on EL

pg_config has been moved to postgresql-server, postgresql-devel
only installs a link to pg_config which is unresolvable without
-server package.

Installing postgresql-server-devel to include headers which are
also required for building psycopg2.

Change-Id: I35548a02f652c035c17aabe149752322ffc869c4
Signed-off-by: Michal Nasiadka <[email protected]>

Author: mnasiadka

docker/openstack-base/Dockerfile.j2

@@ -27,6 +27,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
         'pcre2-devel',
         'postgresql',
         'postgresql-devel',
+        'postgresql-server-devel',
         'python3-devel',
         'python3-mod_wsgi',
         'sqlite-devel',