📰 I got Howdy face unlock to also unlock my keyring, using the TPM — because a face can't be an encryption key

Howdy gives you face login on Linux. What it doesn't give you is a password — and gnome-keyring, KWallet and friends want one. So you get recognised by your face, and then asked for your password anyway. Which rather defeats the point. I spent a while trying to fix this the obvious way and it can't work, so I want to explain why before the actual...