Install Docker on Ubuntu/Debian

install-docker.sh

#!/bin/bash
# based on https://docs.docker.com/engine/install/debian/
# and https://docs.docker.com/engine/install/ubuntu/
# at 2021-05-03

dist=$(lsb_release --id --short | awk '{ print tolower($0) }')
: : : Set up the Docker repository && \
sudo apt update && \
sudo apt -y install \
  apt-transport-https \
  ca-certificates \
  curl \
  gnupg \
  lsb-release && \
curl -fsSL https://download.docker.com/linux/${dist}/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg && \
echo \
  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/${dist} \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null && \
: : : Install Docker && \
sudo apt update && \
sudo apt -y install docker-ce docker-ce-cli containerd.io