Checkpoint

Author: agoscinski

CONTRIBUTING.md

@@ -162,6 +162,12 @@ hatch test
 
 ## Clean test artifacts
 
+Be sure that all airflow services and the docker service have been stopped.
+The docker service can be stopped with.
+```
+hatch run hatch-test.py3.11:stop-psql-service
+```
+
 To clean test artifacts including the PostgreSQL databasese cluster, as well as the aiida and the airflow config.
 ```bash
 hatch run hatch-test.py3.11:clean