message: Re-order dockerfile in example backend slightly
diff: @@ -19,10 +19,8 @@ RUN apt-get update && \
  yarn config set python /usr/bin/python3
  # From here on we use the least-privileged `node` user to run the backend.
  -WORKDIR /app
  -RUN chown node:node /app
  USER node
  -
  +WORKDIR /app
  # This switches many Node.js dependencies to production mode.
  ENV NODE_ENV production
  