Help with restoring Postgresql data in docker from a local data.dump file

Hi, I have started learning data engineering recently and I found a free workshop on it and this is the link for its material data-engineer-handbook/bootcamp/materials/1-dimensional-data-modeling/README.md at main · DataExpert-io/data-engineer-handbook · GitHub

From what i understand , the writer is sending is the data from his database by giving us his backup config file data.dump

Through blood and sweat I was able to setup docker and create a postgresql container instance.
Also coned the repo into my local computer
I am jsut lost in the next steps. I would really appreciate if someone could please help me what am supposed to do next. I have spent two whole days trying for a fix and am losing my will to continue on this.