remove update caching

apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendUpdateFetcher.kt

@@ -29,18 +29,13 @@ class BackendUpdateFetcher(
     private val dispatcherProvider: DispatcherProvider,
     private val userId: Long
 ) : UpdateFetcher {
-    private var config: UpdateInfo? = null
-    private var updateFile: File? = null
 
     override suspend fun fetch(versionCode: Long): UpdateInfo = withContext(dispatcherProvider.io) {
-        config?.let { return@withContext it }
         val configPath = envFetcher.get("UPDATE_CONFIG")
         if (configPath.isBlank()) {
             UpdateInfo()
         } else {
-            json.decodeFromString<UpdateInfo>(File(configPath).readText()).apply {
-                config = this
-            }
+            json.decodeFromString<UpdateInfo>(File(configPath).readText())
         }
     }
 
@@ -48,8 +43,7 @@ class BackendUpdateFetcher(
         val updateFilePath = envFetcher.get("UPDATE_FILE")
         if (updateFilePath.isBlank()) throw HttpException(HttpStatusCode.NotFound.value, "Update not found")
         val file = File(updateFilePath)
-        if (!file.exists()) error("File not exists")
-        updateFile = file
+        if (!file.exists()) throw HttpException(HttpStatusCode.NotFound.value, "Update not exists")
         file
     }
 }