Replaces PLACEHOLDER_PUBLIC_KEY with the real minisign public key
generated via 'tauri signer generate'. The corresponding private key
and password are stored locally; they must be added to GitHub Actions
secrets (TAURI_SIGNING_PRIVATE_KEY and TAURI_SIGNING_PRIVATE_KEY_PASSWORD)
before the first signed release.
Minisign public keys are intended to be public and embedded in the
binary; the updater uses this key to verify the signature of the
downloaded update bundle.
cc
vicrodh
1777760aec