cli: rename clan_flake to test_flake

pkgs/clan-cli/tests/test_flake/flake.nix

@@ -0,0 +1,21 @@
+{
+  # this placeholder is replaced by the path to nixpkgs
+  inputs.nixpkgs.url = "__NIXPKGS__";
+
+  outputs = inputs: {
+    nixosConfigurations.machine1 = inputs.nixpkgs.lib.nixosSystem {
+      modules = [
+        ./nixosModules/machine1.nix
+        (if builtins.pathExists ./machines/machine1.json
+        then builtins.fromJSON (builtins.readFile ./machines/machine1.json)
+        else { })
+        {
+          nixpkgs.hostPlatform = "x86_64-linux";
+          # speed up by not instantiating nixpkgs twice and disable documentation
+          nixpkgs.pkgs = inputs.nixpkgs.legacyPackages.x86_64-linux;
+          documentation.enable = false;
+        }
+      ];
+    };
+  };
+}