configuration/common: pin nixpkgs to host version for nix commands

configuration/common/default.nix

@@ -113,6 +113,23 @@
     ];
   };
 
+  # Pin current nixpkgs channel and flake registry to the nixpkgs version
+  # the host got build with
+  nix.nixPath = lib.mkForce [ "nixpkgs=${lib.cleanSource pkgs.path}" ];
+  nix.registry = {
+    "nixpkgs" = {
+       from = {
+         type = "indirect";
+         id = "nixpkgs";
+       };
+       to = {
+         type = "path";
+         path = lib.cleanSource pkgs.path;
+       };
+       exact = true;
+    };
+  };
+
   services.fstrim.enable = true;
 
   clerie.nixfiles.enable = true;