Ansible task to verify that it's possible to login to github.com via SSH using forward agent

ansible-verify-github-ssh-login.yml

- name: Verify GitHub SSH login
  tags:
    - debug
    - deploy
  shell: |
    ssh_output=$(ssh -T git@github.com &>/dev/stdout)

    echo
    echo Should not be empty:
    echo "SSH_AUTH_SOCK=$SSH_AUTH_SOCK"
    echo
    echo "ssh git@github.com => $ssh_output"
    echo

    if ! grep -q "successfully authenticated" <<< "$ssh_output"; then
      echo
      echo !!!GitHub error: SSH login failed!!!
      echo Make sure your GitHub account public key authentication is working,
      echo and that SSH agent forwarding is configured on your system.
      echo https://developer.github.com/guides/using-ssh-agent-forwarding/
      echo

      exit 1
    fi