$ docker compose exec solr ./bin/solr create -c sandbox -n basic_config
$ docker compose cp solr:/opt/solr/solr/server/solr/sandbox/conf ./solr_config
volumes:
- ...
- ./solr_config:/opt/solr/solr/server/solr/sandbox/conf
$ docker compose down
$ docker compose up -d
$ python manage.py build_solr_schema --configure-directory=./solr_config
$ python manage.py build_solr_schema --reload-core sandbox
$ python manage.py rebuild_index --noinput