cuarto intento

docker-compose.yml

@@ -20,8 +20,8 @@ services:
       DB_USER: usuario
       DB_PASSWORD: clave
       DB_NAME: midb
-    ports:
-      - "4000:4000"
+    expose:
+      - "4000"
     networks:
       - app-net
 
@@ -29,14 +29,16 @@ services:
     build: ./ui
     depends_on:
       - api
-    ports:
-      - "8080:80"
+    expose:
+      - "80"
     networks:
       - app-net
-
+      - principal
 volumes:
   db_data:
 
 networks:
   app-net:
     driver: bridge
+  principal:
+    external: true