L2SS-294: Allow grafana anonymous access, and set default dashboard.

docker-compose/grafana/Dockerfile

 FROM grafana/grafana
 
+COPY grafana.ini /etc/grafana/
+
 # Add default configuration through provisioning (see https://grafana.com/docs/grafana/latest/administration/provisioning)
-#
-# Note: for changes to take effect, make sure you remove the grafana-data and grafana-configs docker volumes
 COPY datasources /etc/grafana/provisioning/datasources/
 COPY dashboards /var/lib/grafana/dashboards/
 COPY stationcontrol-dashboards.yaml /etc/grafana/provisioning/dashboards/