fix cmd

Dockerfile

@@ -10,4 +10,4 @@ RUN apt-get update & apt-get install -y extra-runtime-dependencies & rm -rf /var
 COPY --from=builder /usr/local/cargo/bin/hello-world /usr/local/bin/hello-world
 COPY --from=builder /usr/local/cargo/bin/help /usr/local/bin/help
 
-CMD ["hello-world"]
+CMD ["hello-world", "-m", "Here is a message"]