Fix dataset downloading

changelog.d/20240508_144202_mzhiltso_fix_dataset_downloading.md

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+### Fixed
+
+- The 500 / "The result file does not exist in export cache" error
+  on dataset export request
+  (<https://github.com/cvat-ai/cvat/pull/7864>)

cvat/apps/dataset_manager/apps.py

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+# Copyright (C) 2024 CVAT.ai Corporation
+#
+# SPDX-License-Identifier: MIT
+
+from django.apps import AppConfig
+
+
+class DatasetManagerConfig(AppConfig):
+    name = "cvat.apps.dataset_manager"
+
+    def ready(self) -> None:
+        from django.conf import settings
+
+        from . import default_settings
+
+        for key in dir(default_settings):
+            if key.isupper() and not hasattr(settings, key):
+                setattr(settings, key, getattr(default_settings, key))

cvat/apps/dataset_manager/default_settings.py

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+# Copyright (C) 2024 CVAT.ai Corporation
+#
+# SPDX-License-Identifier: MIT
+
+import os
+
+DATASET_CACHE_TTL = int(os.getenv("CVAT_DATASET_CACHE_TTL", 60 * 60 * 10))
+"Base lifetime for cached exported datasets, in seconds"
+
+DATASET_CACHE_LOCK_TIMEOUT = int(os.getenv("CVAT_DATASET_CACHE_LOCK_TIMEOUT", 10))
+"Timeout for cache lock acquiring, in seconds"
+
+DATASET_EXPORT_LOCKED_RETRY_INTERVAL = int(os.getenv("CVAT_DATASET_EXPORT_LOCKED_RETRY_INTERVAL", 60))
+"Retry interval for cases the export cache lock was unavailable, in seconds"