Make entrypoint script always executable

Dockerfile

@@ -54,7 +54,9 @@ EXPOSE 8500 8600 8600/udp
 # Consul doesn't need root privileges so we run it as the consul user from the
 # entry point script. The entry point script also uses dumb-init as the top-level
 # process to reap any zombie processes created by Consul sub-processes.
+
 COPY .release/docker/docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
 ENTRYPOINT ["docker-entrypoint.sh"]
 
 # By default you'll get an insecure single-node development server that stores