Install Docker on Debian testing

Install prerequisites:

sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
Install GPG key and repository:
curl -fsSL | sudo apt-key add -
To avoid error on apt update:
E: The repository ' sid Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
add docker buster repository:
sudo add-apt-repository "deb [arch=amd64] \
buster \
Install Docker:
sudo apt-get update
apt-get install docker-ce docker-ce-cli