Build arguments

Changes to the examples

Commands

docker container run jfahrer/greeter:latest
docker container run -e NAME=Julian jfahrer/greeter:latest

docker image build -t jfahrer/greeter:lateast .
docker container run jfahrer/greeter:latest

docker image build -t jfahrer/greeter:lateast --build-arg NAME=Julian .
docker container run jfahrer/greeter:latest
docker container run -e NAME=World jfahrer/greeter:latest

One concern per container

Build arguments in Compose