Changed UserName to non-deterministic field

.devcontainer/pgsql/docker-compose.yaml

@@ -25,7 +25,7 @@ services:
     image: postgres:17.2
     restart: unless-stopped
     volumes:
-      - postgres-data:/var/lib/postgresql/data
+      - ./pgdata/var/lib/postgresql/data
     environment:
       POSTGRES_PASSWORD: jellyfin
       POSTGRES_USER: jellyfin
@@ -47,5 +47,4 @@ services:
     # (Adding the "ports" property to this file will not forward from a Codespace.)
 
 volumes:
-  postgres-data:
   pgadmin-data: