I have now started work on the Phoenix LiveView Book.
Still early days on this book.
However this will make creating a phoenix app much easier:
docker run -d -e POSTGRES_PASSWORD=postgres -p 5432:5432 postgres:11
That makes a default password postgres image.
I would not recommend default passwords for anything other than local demo databases.
This makes setup much less painful.
Here is the repo that I am working on: https://github.com/chriseyre2000/pento