Ensure psql returns a failure exit code when it fails

Until now, if the .sql file contained invalid data, psql would
choke on it, but still return an exit code of 0.
This is very misleading.

We need to pass `-v ON_ERROR_STOP=1` to make it exit
with a proper error exit code when failures happen.

roles/matrix-server/tasks/upgrade_postgres.yml

@@ -94,7 +94,7 @@
     --network={{ matrix_docker_network }} \
     --env-file={{ matrix_environment_variables_data_path }}/env-postgres-pgsql-docker \
     -v {{ postgres_dump_dir }}:/in:ro \
-    {{ matrix_postgres_docker_image_latest }} psql -h matrix-postgres -f /in/{{ postgres_dump_name }}
+    {{ matrix_postgres_docker_image_latest }} psql -v ON_ERROR_STOP=1 -h matrix-postgres -f /in/{{ postgres_dump_name }}
 
 - name: Delete Postgres database dump file
   file: