thanatos: avoid GC

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/3ffbbdbac0566a0977da3d2657b89cbcfe9a173b' (2024-12-30)
  → 'github:NixOS/nixpkgs/cbd8ec4de4469333c82ff40d057350c30e9f7d36' (2025-01-05)

flake.lock

@@ -257,11 +257,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1735531152,
+        "lastModified": 1736061677,
-        "narHash": "sha256-As8I+ebItDKtboWgDXYZSIjGlKeqiLBvjxsQHUmAf1Q=",
+        "narHash": "sha256-DjkQPnkAfd7eB522PwnkGhOMuT9QVCZspDpJJYyOj60=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "3ffbbdbac0566a0977da3d2657b89cbcfe9a173b",
+        "rev": "cbd8ec4de4469333c82ff40d057350c30e9f7d36",
         "type": "github"
       },
       "original": {

hosts/thanatos/default.nix

@@ -93,4 +93,6 @@ in {
   environment.systemPackages = with pkgs; [
     docker-compose
   ];
+
+  nix.gc.automatic = lib.mkForce false;
 }