ssh forge ansible

I like to use ansible. forge gives me a lost but I want to push things further.

I have generated an ssh key pem and public key privately.

I would like to use a forge recipe to add this to all the servers under the root account.

I could do it individually but its going to take me a long time.

Surely someone smarter knows how to mass add an ssh key to all servers in forge to the root user.

this will allow me to then add extra software or other requirements to the pool of client servers in forge. eg add zsh. install imagick auto configure custom requirements