chore: rename postgresql service to zipline-postgresql in compose.yaml

Co-authored-by: Copilot <copilot@github.com>

nodes/heimdall/zipline/compose.yaml

@@ -1,5 +1,5 @@
 services:
-  postgresql:
+  zipline-postgresql:
     image: postgres:16
     container_name: zipline-postgresql
     restart: unless-stopped
@@ -28,9 +28,9 @@ services:
     networks:
       - proxy-net
     environment:
-      - DATABASE_URL=postgres://${POSTGRESQL_USER:-zipline}:${POSTGRESQL_PASSWORD}@postgresql:5432/${POSTGRESQL_DB:-zipline}
+      - DATABASE_URL=postgres://${POSTGRESQL_USER:-zipline}:${POSTGRESQL_PASSWORD}@zipline-postgresql:5432/${POSTGRESQL_DB:-zipline}
     depends_on:
-      postgresql:
+      zipline-postgresql:
         condition: service_healthy
     volumes:
       - '/mnt/appdata/zipline/uploads:/zipline/uploads'