disabled auth by default (when no JWT secret is specified)

internal/common/crypto.go

@@ -23,6 +23,9 @@ func generateJWTKey(size int) string {
 }
 
 func decodeJWTKey(key string) []byte {
+	if key == "" {
+		return nil
+	}
 	bytes, err := base64.StdEncoding.DecodeString(key)
 	if err != nil {
 		log.Panic().Err(err).Msg("failed to decode jwt key")