install ping

docker/dev/server.Dockerfile

@@ -1,5 +1,10 @@
 FROM node:20-slim
 
+# Install ping
+RUN apt-get update \
+    && apt-get install -y iputils-ping \
+    && rm -rf /var/lib/apt/lists/*
+
 WORKDIR /app
 
 COPY ./server/package*.json ./