dev-docker: add grafana as target

docker/blocks/prometheus/prometheus.yml

@@ -33,4 +33,4 @@ scrape_configs:
 
     static_configs:
       #- targets: ['localhost:9090', '172.17.0.1:9091', '172.17.0.1:9100', '172.17.0.1:9150']
-      - targets: ['localhost:9090', '127.0.0.1:9091', '127.0.0.1:9100', '127.0.0.1:9150']
+      - targets: ['localhost:9090', '127.0.0.1:9091', '127.0.0.1:9100', '127.0.0.1:3000']