flake.lock: Update

Flake lock file changes:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/9ab7d12287ced0e1b4c03b61c781901f178d9d77' (2021-12-21)
  → 'github:NixOS/nixpkgs/d887ac7aee92e8fc54dde9060d60d927afae9d69' (2021-12-27)
• Updated input 'nixpkgs-unstable':
    'github:NixOS/nixpkgs/81cef6b70fb5d5cdba5a0fef3f714c2dadaf0d6d' (2021-12-22)
  → 'github:NixOS/nixpkgs/ac169ec6371f0d835542db654a65e0f2feb07838' (2021-12-26)

flake.lock

@@ -75,11 +75,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1640077788,
-        "narHash": "sha256-YMSDk3hlucJTTARaHNOeQEF6zEW3A/x4sXgrz94VbS0=",
+        "lastModified": 1640572776,
+        "narHash": "sha256-pWMTubBy1Ep31iuQ5lEKW2mjSHWEvcbvy9uHVch2764=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9ab7d12287ced0e1b4c03b61c781901f178d9d77",
+        "rev": "d887ac7aee92e8fc54dde9060d60d927afae9d69",
         "type": "github"
       },
       "original": {
@@ -105,11 +105,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1640139330,
-        "narHash": "sha256-Nkp3wUOGwtoQ7EH28RLVJ7EqB/e0TU7VcsM7GLy+SdY=",
+        "lastModified": 1640540585,
+        "narHash": "sha256-cCmknKFjWgam9jq+58wSd0Z4REia8mjBP65kXcL3ki8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "81cef6b70fb5d5cdba5a0fef3f714c2dadaf0d6d",
+        "rev": "ac169ec6371f0d835542db654a65e0f2feb07838",
         "type": "github"
       },
       "original": {

systems/PC-Fixe/configuration.nix

@@ -12,6 +12,8 @@
       ../common-gui.nix
     ];
 
+  nix.trustedUsers = [ "root" "paul" ];
+
   boot.loader.efi.canTouchEfiVariables = true;
   boot.loader.grub = {
     efiSupport = true;