Add persistance and incus

modules/common/persisting.nix

@@ -0,0 +1,31 @@
+{ config, lib, pkgs, ... }:
+
+{
+  persisting = {
+    enable = true;
+    
+    # Default directories to persist
+    directories = [
+      {
+        path = "/persist";
+        target = "/persist";
+        options = [ "defaults" "bind" ];
+      }
+      {
+        path = "/var/log";
+        target = "/var/log";
+        options = [ "defaults" "bind" ];
+      }
+      {
+        path = "/var/lib";
+        target = "/var/lib";
+        options = [ "defaults" "bind" ];
+      }
+    ];
+  };
+  
+  # Ensure persist directory exists
+  systemd.tmpfiles.rules = [
+    "d /persist 0755 root root - -"
+  ];
+}