host:		docker-compose -p bis-trunk -f docker/docker-compose.yml -f docker/shop-admin.yml up
host:		docker exec -it bistrunk_app_1 /bin/bash
container:	sudo apt-get update && apt-get install zsh
container: 	ctrl+d    (for exiting)
host:		docker exec -it bistrunk_app_1 zsh       (for reentering)

with mapping an additional host-directory into the container's home folder:
docker-compose -p bis-trunk -f docker/docker-compose.yml -f docker/shop-admin.yml -f ~/dotfilevolume.docker up

dotfilevolume.docker:

version: '3'
services:
  app:
    volumes:
	   - /home/martin/docker-home:/root