Please support public keys instead of password maybe even from GitHub account #20
Description
When needing to authenticate a connection it would be nice if you could configure an SSH public key that is then accepted instead of a password.
As the https://github.com/joshlarsen/ssh-tunnel-action/ action has this possibility, it would be nice if it would also be supported here, especially as that action is Linux-only and does not work on macOS or Windows.
An additional possibility would be to accept the public keys uploaded to the GitHub account of the run-causing user automatically if possible. Afair it should be doable.