Updated docker-compose to use swarm port binding

docker-compose.yml

@@ -13,7 +13,9 @@ services:
     image: mongo-express
     restart: always
     ports:
-      - "8081:8081"
+      - target: 8081
+        published: 8081
+        mode: host
     environment:
       ME_CONFIG_MONGODB_ADMINUSERNAME: root
       ME_CONFIG_MONGODB_ADMINPASSWORD: password
@@ -43,7 +45,9 @@ services:
     build: ./frontend
     restart: always
     ports:
-      - "3000:3000"
+      - target: 3000
+        published: 3000
+        mode: host
     environment:
       MONGO_USER: root
       MONGO_PASS: password