fix(testing): Fix postgres volume.

The volume was not mapped to the correct directory and when it was, the bitnami container would have no access for writing into that directory. That was limiting since we could only write about 100MB which for some tests is not enough. Now we simply increase the SHM and do not use any mapping to sidestep the permission issues.

testing/docker-compose.yaml

@@ -12,8 +12,7 @@ services:
       POSTGRESQL_SHARED_PRELOAD_LIBRARIES: pg_cron
     ports:
       - "5431:5432"
-    volumes:
-      - postgres_data:/var/lib/postgresql/data
+    shm_size: '1gb'
   app:
     build:
       context: .