Hi!
Not long ago, maybe half a year, the docker option that was available when deploying apps on Azure has been sunset entirely. I’ve noticed since I tried to follow the tutorial, and no matter what I did, I could not follow it through. Some googling later and I’ve found out that the service has since changed since the tutorial was written.
I suggest that the tutorial either be updated or removed. As of now, it’s not something that can be done as described and it does nothing but waste peoples time :(.