feat(recovery): add offline Btrfs base checkpoints and resumable restore

bin/hydra-system

@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+"""Source checkout entry point; installed copies use the installed Python package."""
+from pathlib import Path
+import sys
+
+checkout = Path(__file__).resolve().parent.parent
+if (checkout / 'hydra/system_recovery.py').is_file():
+    sys.path.insert(0, str(checkout))
+from hydra.system_recovery import main
+
+raise SystemExit(main())