Enforce local bin files mode (#24)

If you modify those files, COPY will keep their attributes and may
break the generated container. This fix enforce more 755 for files
from local bin directory

ecs/Dockerfile

@@ -67,6 +67,7 @@ RUN apk upgrade --update musl \
 WORKDIR $HOME
 COPY --from=builder /ejabberd/runtime .
 COPY bin/* bin/
+RUN chmod 755 bin/ejabberdctl bin/ejabberdapi bin/erl
 COPY --chown=ejabberd:ejabberd conf conf/
 ADD --chown=ejabberd:ejabberd https://download.process-one.net/cacert.pem conf/cacert.pem