Setting up GitHub on a new machine

The goal here is to set up a new SSH key and a GPG signing key for a new MacOS machine, using the GitHub gh cli.

Install the CLI using Homebrew:

brew install gh

Then login:

gh auth login

Authorize the CLI to manage signing keys:

gh auth refresh -h github.com -s admin:ssh_signing_key

Create a new RSA key:

ssh-keygen -t rsa -b 4096

Add the new public key:

gh ssh-key add ~/.ssh/id_rsa.pub