Found during testing with #262. Modifying `postgresql.conf` doesn't work. It requires customising the `systemd` service as outlined [on this page](https://stackoverflow.com/questions/25148693/need-help-to-change-postgresql-port-on-centos-7).
Found during testing with #262. Modifying
postgresql.confdoesn't work. It requires customising thesystemdservice as outlined on this page.