docker use extra hosts

on build:

docker build  --add-host foo.bar:1.2.3.4 -t  test/test1 .

or on run:

docker run -d --name test1  --add-host foo.bar:1.2.3.4  test/test1

or docker-compose:

test1:
  build: test/test1
  extra_hosts:
    foo.bar: 1.2.3.4