Just run start.sh
I assume you have a running PostgreSQL 16+ installed, that can be simply accessed using psql
(i.e., username, password, database, port, etc. are either default or set via environment variables).
One of the examples uses pstree to show PostgreSQL process tree, so be sure it's installed on your system.
By installing viu, you'll get a better experience, as it can display images like this in terminals with natives support for graphics protocol (e.g., iTerm2 and Kitty):