update sample docker setup to install curl and use it for healthcheck

Author: raphaeltm

starter-sample/app/Dockerfile

@@ -4,6 +4,11 @@
 
 FROM node:20-bookworm-slim
 
+RUN apt-get update -qq \ 
+    && apt-get install -y curl \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
 WORKDIR /app
 
 COPY package*.json ./

starter-sample/compose.yaml

@@ -16,4 +16,4 @@ services:
     healthcheck:
       # wget or curl required for healthchecks on services with a published port
       # this gets parsed by Defang and provided to the load balancers as well
-      test: ["CMD", "wget", "-q", "--spider", "http://localhost:3000/"]
+      test: ["CMD", "curl", "-f", "http://localhost:3000/"]