[Add]prometheus default config file for node_exporter

docker-compose.yml

@@ -8,6 +8,8 @@ services:
     build: docker/confd
   prometheus:
     build: docker/prometheus
+    ports:
+      - 9090:9090
   panel:
     build: docker/panel
     volumes:
@@ -15,5 +17,5 @@ services:
     entrypoint: php artisan serve --host=0.0.0.0
     ports:
       - 8000:8000
-  node_exporter:
+  node-exporter:
     build: docker/node_exporter