Install Docker from apt repository on Debian 11

install-docker.sh

# Stolen and compiled into one shell script
# from https://docs.docker.com/engine/install/debian/

# Uninstall old versions
for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do sudo apt-get remove $pkg; done

# Set up the repository

## Update the apt package index and install packages to allow apt to use a repository over HTTPS:
sudo apt-get update
sudo apt-get install ca-certificates curl gnupg

## Add Docker’s official GPG key
sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg

## Use the following command to set up the repository
echo \
  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \
  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# Install Docker Engine

## Update the apt package index
sudo apt-get update

## Install Docker Engine, containerd, and Docker Compose (latest)
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

## Verify that the Docker Engine installation is successful by running the hello-world image
sudo docker run hello-world