Error: Wrong password for that key for empty passwords on Windows

[FabianLars]

Hello 👋

When upgrading from 0.7.3 to 0.7.5 we've started getting an Wrong password for that key error when using no/empty passwords on Windows (100% reliably) when calling sign(). We also saw this happening on Linux after a while but i think it wasn't reliably reproducible.
Speaking of reproduction, i couldn't reproduce it in a standalone rust project yet, only in Tauri's CLI but i wanted to reach out already anyway. -> I will update this issue once i am able to repro it but i have to focus on some other stuff for a while.

In case you wanna look into it without me providing a minimal repro, the relevant function is here: https://github.com/tauri-apps/tauri/blob/4dd4893d7d166ac3a3b6dc2e3bd2540326352a78/tooling/cli/src/helpers/updater_signature.rs#L103 with the password being either None (so that minisgn asks for the pw) or an empty String (if CI env var is set) - both variants show the same behavior.

Thank you

P.S. For reference the PR where we locked minisign to 0.7.3: tauri-apps/tauri#7197