Implement `sync-ssh-keys`

[ProfessorManhattan]

trafficstars

💡 Feature/Idea

Add logic that will implement sync-ssh-keys. See: https://github.com/shoenig/ssh-key-sync. Be sure to test whether or not this works on macOS and how we can implement it on Windows as well. The system service should look up the GH username from $HOME/.config/chezmoi/chezmoi.yaml

:thumbsup: Can you contribute?

No response

[enggnr]

@ProfessorManhattan, we are installing https://github.com/samber/sync-ssh-keys via software.yml. This supports GitLab in addition to GitHub. Do we want to configure this instead?

[ProfessorManhattan]

Let's hold off on this one for now.