Simplify compose file for Portainer compatibility

postgresql/docker-compose.yml

@@ -1,7 +1,6 @@
 services:
   postgres:
     image: postgres:16
-    container_name: postgres_db
     restart: unless-stopped
     environment:
       POSTGRES_USER: postgres
@@ -12,12 +11,9 @@ services:
       - postgres_data:/var/lib/postgresql/data
     ports:
       - "5432:5432"
-    networks:
-      - postgres_network
 
   pgadmin:
     image: dpage/pgadmin4:latest
-    container_name: pgadmin
     restart: unless-stopped
     environment:
       PGADMIN_DEFAULT_EMAIL: admin@example.com
@@ -26,15 +22,9 @@ services:
       - pgadmin_data:/var/lib/pgadmin
     ports:
       - "8080:80"
-    networks:
-      - postgres_network
     depends_on:
       - postgres
 
 volumes:
   postgres_data:
   pgadmin_data:
-
-networks:
-  postgres_network:
-    driver: bridge