Reduce the docker image size

Author: git-hulk

Dockerfile

@@ -1,10 +1,13 @@
-FROM golang:1.17
+FROM golang:1.17 AS builder
 
 WORKDIR /lmstfy
 
 ADD ./ /lmstfy
 RUN apt update -y && apt install -y netcat
 RUN cd /lmstfy && make
+
+FROM ubuntu:20.04
+COPY --from=builder /lmstfy /lmstfy
 EXPOSE 7777:7777
 ENTRYPOINT ["/lmstfy/_build/lmstfy-server", "-c", "/lmstfy/config/docker-image-conf.toml"]