rename setup dir to build

Dockerfile

@@ -33,11 +33,11 @@ RUN \
     rm -rf /root/go && \
     rm /etc/ssh/*host*key*
 
-COPY ./setup /tmp/setup
-RUN bash /tmp/setup/run.sh
-
 COPY ./root /
 
+COPY ./build /tmp/build
+RUN bash /tmp/build/run.sh && rm -rf /tmp/build
+
 RUN chmod +rx /etc/service/*/run
 
 CMD ["/usr/local/sbin/runsvinit"]