actually hide test-fixture from user

if we actually want to avoid the dependency on this facter json, we
cannot expose this as a flake input because nix flake archive will have
to download this on each deployment step.

checks/installation-without-system/flake-module.nix

@@ -1,7 +1,6 @@
 {
   self,
   lib,
-  inputs,
   ...
 }:
 {
@@ -19,7 +18,11 @@
     imports = [ self.nixosModules.test-install-machine-without-system ];
   };
   clan.machines.test-install-machine-with-system = {
-    facter.reportPath = "${inputs.test-fixtures}/nixos-vm-facter-json/facter.json";
+    # https://git.clan.lol/clan/test-fixtures
+    facter.reportPath = builtins.fetchurl {
+      url = "https://git.clan.lol/clan/test-fixtures/raw/commit/3508b7ed11dad068ffc8c9f0047a5c7d54644e2c/nixos-vm-facter-json/facter.json";
+      sha256 = "sha256:16myh0ll2gdwsiwkjw5ba4dl23ppwbsanxx214863j7nvzx42pws";
+    };
 
     fileSystems."/".device = lib.mkDefault "/dev/vda";
     boot.loader.grub.device = lib.mkDefault "/dev/vda";

flake.lock

@@ -75,7 +75,6 @@
         "nixpkgs": "nixpkgs",
         "sops-nix": "sops-nix",
         "systems": "systems",
-        "test-fixtures": "test-fixtures",
         "treefmt-nix": "treefmt-nix"
       }
     },
@@ -115,31 +114,6 @@
         "type": "github"
       }
     },
-    "test-fixtures": {
-      "inputs": {
-        "flake-parts": [
-          "flake-parts"
-        ],
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1741504481,
-        "narHash": "sha256-Ndx7LCbLF2sgRvbiefKEe1rgL+cYlBANVRokg27DflI=",
-        "ref": "main",
-        "rev": "3508b7ed11dad068ffc8c9f0047a5c7d54644e2c",
-        "shallow": true,
-        "type": "git",
-        "url": "https://git.clan.lol/clan/test-fixtures"
-      },
-      "original": {
-        "ref": "main",
-        "shallow": true,
-        "type": "git",
-        "url": "https://git.clan.lol/clan/test-fixtures"
-      }
-    },
     "treefmt-nix": {
       "inputs": {
         "nixpkgs": [

flake.nix

@@ -19,10 +19,6 @@
 
     treefmt-nix.url = "github:numtide/treefmt-nix";
     treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
-
-    test-fixtures.url = "git+https://git.clan.lol/clan/test-fixtures?ref=main&shallow=1";
-    test-fixtures.inputs.flake-parts.follows = "flake-parts";
-    test-fixtures.inputs.nixpkgs.follows = "nixpkgs";
   };
 
   outputs =