Check for Updates… now disappears when GitHub confirms the installed version
matches the latest release. Automatic checks continue at launch and hourly;
Update slock… appears when a newer release is available.
An unchecked version or failed initial check keeps the action available. Update
progress remains visible while checking, downloading, or installing.
Install: choose Check for Updates… / Update slock… in slock, or download
slock.app.zip below. SHA256SUMS contains the ZIP checksum;
slock-update.json is used by the native updater.
Supports macOS 13+, Apple Silicon and Intel. Signed with the same Developer ID
identity as v0.3.0 and the existing update-signing key. The app is not notarized.