auto-optimisation du store, options du ramasse-miettes

configuration/auto-upgrade.nix

@@ -12,5 +12,12 @@ mkIf flags.auto-upgrade {
   # Automatic update & automatic clean
 
   system.autoUpgrade.enable = true;
-  nix.gc.automatic = true;
+  nix = {
+    autoOptimiseStore = true;
+    gc = {
+      automatic = true;
+      dates = "daily";
+      options = "--delete-older-than 7d";
+    };
+  };
 }