remove portforward, add public network

docker-compose.yml

@@ -1,7 +1,10 @@
-services:
-  cg1:
-    image: nginx:alpine
-    volumes:
-      - ./src:/usr/share/nginx/html:ro
-    ports:
-      - "8080:80"
+services:
+  cg1:
+    image: nginx:alpine
+    volumes:
+      - ./src:/usr/share/nginx/html:ro
+    networks:
+      - public
+networks:
+  public:
+    external: true