fix bake nginx config into image to avoid Portainer volume mount issue

docker-compose.yml

@@ -1,10 +1,8 @@
 services:
   nginx:
-    image: nginx:alpine
+    build: ./nginx
     ports:
       - "80:80"
-    volumes:
-      - ./nginx/nginx.conf:/etc/nginx/conf.d/default.conf:ro
     depends_on:
       - frontend
       - backend

nginx/Dockerfile

@@ -0,0 +1,2 @@
+FROM nginx:alpine
+COPY nginx.conf /etc/nginx/conf.d/default.conf