Configure entrypoint

Author: ddeboer

Dockerfile

@@ -1,5 +1,8 @@
 FROM erlang:23.0-alpine
 
-ADD rebar.config /root/.config/rebar3/rebar.config
+COPY rebar.config /root/.config/rebar3/rebar.config
+COPY entrypoint.sh /entrypoint.sh
 
 RUN rebar3 update
+
+ENTRYPOINT ["/entrypoint.sh"]