add config file setting to disable keyring (related: #538)

backend/app.go

@@ -136,7 +136,7 @@ func StartupApp(appName, displayAppName, appVersion, appVersionTag, latestReleas
 		return nil, err
 	}
 
-	a.ServerManager = NewServerManager(appName, appVersion, a.Config, !portableMode /*use keyring*/)
+	a.ServerManager = NewServerManager(appName, appVersion, a.Config, !portableMode && a.Config.Application.EnablePasswordStorage)
 	a.PlaybackManager = NewPlaybackManager(a.bgrndCtx, a.ServerManager, a.LocalPlayer, &a.Config.Playback, &a.Config.Scrobbling, &a.Config.Transcoding, &a.Config.Application)
 	a.ImageManager = NewImageManager(a.bgrndCtx, a.ServerManager, cacheDir)
 	a.Config.Application.MaxImageCacheSizeMB = clamp(a.Config.Application.MaxImageCacheSizeMB, 1, 500)

backend/config.go

@@ -47,6 +47,7 @@ type AppConfig struct {
 	AddToPlaylistSkipDuplicates bool
 	ShowTrackChangeNotification bool
 	EnableLrcLib                bool
+	EnablePasswordStorage       bool
 	SkipSSLVerify               bool
 	EnqueueBatchSize            int
 	Language                    string
@@ -180,6 +181,7 @@ func DefaultConfig(appVersionTag string) *Config {
 			SaveQueueToServer:           false,
 			ShowTrackChangeNotification: false,
 			EnableLrcLib:                true,
+			EnablePasswordStorage:       true,
 			SkipSSLVerify:               false,
 			EnqueueBatchSize:            100,
 			Language:                    "auto",