Add beamline config data for completeness

(cherry picked from commit 0420a902)

containers/jug/xl.Dockerfile

@@ -118,6 +118,8 @@ RUN cd /tmp
          >> /opt/detector/setup.sh                                              \
  && echo "export JUGGLER_DETECTOR_VERSION=${DETECTOR_VERSION}"                  \
          >> /opt/detector/setup.sh                                              \
+ && echo "BEAMLINE_CONFIG=ip6"                                                  \
+ && echo "BEAMLINE_CONFIG_VERSION=${IP6_VERSION}"                               \
  && echo "export JUGGLER_INSTALL_PREFIX=/usr/local"                             \
          >> /opt/detector/setup.sh