Merge branch 'bug/82_persist_solr' into 'develop'

Fixed solr volume, as per solr 8 docker documentation

See merge request FDM/rdm-system/rdms!30

docker-compose.yml

@@ -40,7 +40,7 @@ services:
     networks:
       internal:
     volumes:
-      - solr:/opt/solr/server/solr/mycores
+      - solr:/var/solr
       - ./hyrax/solr/conf:/opt/solr/solr_conf
     command:
       - sh