Revert "Set user."

This reverts commit 587b2b7.

Author: hadrianvalentine

Dockerfile

@@ -27,5 +27,4 @@ RUN bundle install --jobs 4 --retry 3
 VOLUME "${GEMSTASH_HOME}/data"
 
 EXPOSE 9292
-USER ${GEMSTASH_USER}:${GEMSTASH_USER}
 CMD ["bundle", "exec", "gemstash", "start", "--no-daemonize"]