Change file ownership for the init script

This change gives the postgres user the right to execute the init sql
script. This is required in order to create the gc user used by the
gc-conductor plugin.

Change-Id: Id6fd8fb4fb5a56e2f3f65a34ed60dcd969bfc0f2

src/test/docker/postgresql/Dockerfile

diff --git a/src/test/docker/postgresql/Dockerfile b/src/test/docker/postgresql/Dockerfile
index da40c6f..68b9df5 100644
--- a/src/test/docker/postgresql/Dockerfile
+++ b/src/test/docker/postgresql/Dockerfile
@@ -3,3 +3,4 @@
 FROM $POSTGRES_IMAGE
 
 ADD init_setup.sql /docker-entrypoint-initdb.d/
+RUN chown -R postgres:postgres /docker-entrypoint-initdb.d/*.sql