diff --git a/docker-compose.yaml b/docker-compose.yaml
index dedf364..6312be5 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -3,12 +3,11 @@ version: '3.8'
 services:
   # 1. Nginx Gateway Reverse Proxy
   gateway:
-    image: nginx:alpine
+    build:
+      context: ./docker/nginx   # Build from our custom Dockerfile
     container_name: gis_gateway
     ports:
       - "${HOST_PORT_GATEWAY:-80}:80"
-    volumes:
-      - ./docker/nginx/default.conf:/etc/nginx/conf.d/default.conf:ro
     depends_on:
       - php-app
       - next-app
diff --git a/docker/nginx/Dockerfile b/docker/nginx/Dockerfile
new file mode 100644
index 0000000..8ab0de0
--- /dev/null
+++ b/docker/nginx/Dockerfile
@@ -0,0 +1,7 @@
+FROM nginx:alpine
+
+# Copy the Nginx configuration into the image at build time.
+# This avoids bind-mount issues on production servers (e.g., Coolify).
+COPY default.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80