deb http://deb.devuan.org/merged ascii main non-free contrib

apt update

sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg2 \
    software-properties-common

curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -

edit sources.list again

deb [arch=amd64] https://download.docker.com/linux/debian stretch stable

apt update

sudo apt install docker-ce