Support PINs

[jGleitz]

Hi, and thank you soooo much for these scripts! I don’t think I would ever have gotten this working without them.

Could you imagine supporting PINs for unlocking?

I have setup a PIN by passing --tpm2-with-pin=true to systemd-cryptenroll. This ‘works’ in the sense that after boot, I get stuck on the loading spinner. If I type the PIN there, I can unlock the device.

Ideally, I’d imagine having a similar dialog for the PIN as exists for the passphrase, together with helpful error messages. I don’t know how much work that would mean, but after seeing #7, I hoped that it would be doable.

I’m happy to help, but I currently wouldn’t know where to start. I definitely can test.