tests: minify test machines to decrease runtime

checks/lib/container-test.nix

@@ -10,7 +10,9 @@ in
     hostPkgs = pkgs;
     # speed-up evaluation
     defaults = {
-      nix.package = pkgs.nixVersions.latest;
+      imports = [
+        ./minify.nix
+      ];
       documentation.enable = lib.mkDefault false;
       boot.isContainer = true;
 

checks/lib/minify.nix

@@ -0,0 +1,7 @@
+{
+  nixpkgs.flake.setFlakeRegistry = false;
+  nixpkgs.flake.setNixPath = false;
+  nix.registry.nixpkgs.to = { };
+  documentation.doc.enable = false;
+  documentation.man.enable = false;
+}

checks/lib/test-base.nix

@@ -8,9 +8,11 @@ in
   hostPkgs = pkgs;
   # speed-up evaluation
   defaults = {
+    imports = [
+      ./minify.nix
+    ];
     documentation.enable = lib.mkDefault false;
     nix.settings.min-free = 0;
-    nix.package = pkgs.nixVersions.latest;
   };
 
   # to accept external dependencies such as disko