Docker : container access host network

• connect to a service running on your host from a container

就是用 "--add-host="host.docker.internal:host-gateway"，docker 會再container 的dns中加入 host.docker.internal 到 host ip
測試可以用:

docker container run --rm \
  --add-host="host.docker.internal:host-gateway" \
  debian:stable-slim \
  bash -c "apt-get update && apt-get install -y iputils-ping && ping -c 3 host.docker.internal"