Fix ipmon-server healthcheck

Dockerfile.server

@@ -4,10 +4,9 @@ COPY . .
 RUN cargo build --bin ipmon-server --release
 
 FROM debian:bullseye-slim
-RUN apt update && apt upgrade -y
-RUN apt install -y wget
+RUN apt update && apt install -y curl && rm -rf /var/lib/apt/lists/*
 HEALTHCHECK --interval=5m --timeout=3s \
-  CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1
+  CMD curl --fail http://localhost:8080/health || exit 1
 EXPOSE 8080
 WORKDIR /app
 COPY --from=build /ipmon/target/release/ipmon-server ./