feat: update settings move under updates, with an interval

updates.autoCheck (was updateCheck) and updates.updateSources (was
releases) sit together with updates.autoCheckInterval, a duration (24h
by default) for how often lazysecrets looks for a newer release on its
own.

cmd/lazysecrets/main.go

@@ -225,6 +225,10 @@ Flags:
 	if cfg.LoadDelay != nil {
 		loadDelay = *cfg.LoadDelay
 	}
+	var updateEvery time.Duration // 0: the app's default, a day
+	if cfg.Updates.AutoCheckInterval != nil {
+		updateEvery = *cfg.Updates.AutoCheckInterval
+	}
 	if !set["icons"] {
 		switch {
 		case os.Getenv("LAZYSECRETS_ICONS") != "":
@@ -379,8 +383,9 @@ Flags:
 		ExpiryWarning:  time.Duration(expiryDays) * 24 * time.Hour,
 		HideOnBlur:     config.On(cfg.HideOnBlur),
 		HandlerSetup:   setup,
-		Updater:        updater(cfg.Releases),
-		UpdateCheck:    config.On(cfg.UpdateCheck),
+		Updater:        updater(cfg.Updates.UpdateSources),
+		UpdateCheck:    config.On(cfg.Updates.AutoCheck),
+		UpdateEvery:    updateEvery,
 		Keys:           &keymap,
 		Commands:       cfg.CustomCommands,
 		Version:        versionString(),