We've noticed, with persistent storage, that if the script is interrupted between lines 16 and 20 users never get created even on following container restarts because "$PGDATA/postgresql.conf" gets created before create_users is run.
I have added states for each critical step in the startup in the folder "$PGDATA/status".
As a side question, is there a particular reason to call set_passwords every time? (this is why I have also added the if status for it)

This will delete all database files in case the script has been interrupted before touching 1.initialize_database_done
It should not harm as initialize_database expects $PGDATA to be empty