add configuration to use traefik-golang sample with Docker Dev Environments feature (#254)

* add configuration to use traefik-golang sample with Docker Dev Environments feature
* use apt-get instead of apt and --no-install-recommends option

Co-authored-by: Milas Bowman <milasb@gmail.com>
Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>