Ssh-agent

ssh-agent bash -c 'ssh-add /somewhere/yourkey; git clone git@github.com:user/project.git'

          ssh-agent bash
          ssh-add - <<< $(echo "${{ secrets.PRIVATE_SSH_KEY }}")
          ssh-keyscan -H 10.x.x.x >> ~/.ssh/known_hosts

Windows

Start-Service ssh-agent
ssh-add $HOME\.ssh\mysshkey
ssh myremoteuser@myremotehost

Set Lifetime of loaded key

ssh-add -t 3600 ~/.ssh/id_rsa

Remove

ssh-add -d ~/.ssh/id_rsa  # Remove a specific key
ssh-add -D  # Remove all keys