See the below discussion. These instructions should be changed to account for apt-key deprecation in Ubuntu 22.04 LTS
Here's how I was able to add this keyring
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/ubuntu_docker.gpg > /dev/null
Discussed in #778
Originally posted by KodeStar March 17, 2022
Install Docker
Step 1 – Add the GPG key for the official Docker repository to the system:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -