At some point PostgreSQL image was changed from 9.5.2 to 9.6.11 making upgrade not that simple for people that directly use those example files. This has already been queried.
The script is supposed to make upgrade for such cases easier, dumping all database contents with the old image and importing them to new database.
Thanks @raspy for the contribution! Can I ask that you also add a note about this in the README?
This should explain the case and usage of this script.
At some point PostgreSQL image was changed from 9.5.2 to 9.6.11 making upgrade not that simple for people that directly use those example files. This has already been queried.
The script is supposed to make upgrade for such cases easier, dumping all database contents with the old image and importing them to new database.