fix: integration tests background-worker postgresql params

Author: blackheaven

services/background-worker/background-worker.integration.yaml

@@ -42,7 +42,8 @@ backgroundJobs:
   maxAttempts: 3
 
 postgresql:
-  host: "postgresql"
+  host: 127.0.0.1
   port: "5432"
   user: wire-server
-  dbname: wire-server
+  dbname: backendA
+  password: posty-the-gres