bundle nix packagemanager by default

detsys nix lazy-path seems to be incompatible with our caching and
deployment commands. By shipping nix, we can be sure to have binaries we
tested.

pkgs/clan-cli/clan_lib/nix/allowed-packages.json

@@ -10,19 +10,19 @@
   "avahi",
   "bash",
   "bubblewrap",
+  "dialog",
   "disko",
   "e2fsprogs",
   "git",
   "gnupg",
-  "dialog",
   "mypy",
   "netcat",
   "nix",
   "nixos-anywhere",
-  "qrencode",
   "openssh",
   "pass",
   "qemu",
+  "qrencode",
   "rsync",
   "shellcheck-minimal",
   "sops",

pkgs/clan-cli/flake-module.nix

@@ -56,6 +56,7 @@
           includedRuntimeDeps = [
             "age"
             "git"
+            "nix"
           ];
           inherit (self) nixosConfigurations;
         };