Update README

ADD tarball.tar.gz ./destiantion/
untars tarball.tar.gz from host into destination

Author: Rudolf Manusadzhian

README.md

@@ -65,10 +65,7 @@ EXPOSE 4000
 
 WORKDIR /srv/app_name
 
-COPY --from=build ./_build/prod/app_name-APP_VERSION.tar.gz .
-
-RUN tar zxf app_name-APP_VERSION.tar.gz \
-    && rm app_name-APP_VERSION.tar.gz
+ADD --from=build ./_build/prod/app_name-APP_VERSION.tar.gz .
 
 ENTRYPOINT ["avvoenv", "exec"]
 CMD ["bin/app_name", "start"]