Error while Creating a new Docker Image, the file content mismatch comparing the demo video and the file in the github

I am trying to practice the Creating a new Docker Image.
Found that the file in github is bit different to the one showed in the demo, which has Database connections. So I have created similar with database connections, but got an error.
Can I find a full file with database connections, I may be missing something else.

Lol, it only allows me to add only one picture…!!!

try this link git clone
cd example-voting-app/
then build your images

Hey, i tried to take file and to write cat > /opt/ .
and then flask run --host= but is the same