fix(modules): repair x86_64 host builds after flake update - #401

router-test> failed running package evaluation. If you have `nix` installed, you can reproduce the error locally by running: prlimit --as=8589934592 nix build /tmp/garnix-runs-df7f11d4e53c0d15#packages.x86_64-linux.router-test --dry-run --json
router-test> error:
       … while evaluating the attribute 'optionalValue.value'
         at «github:nixos/nixpkgs/293d6abedf0478e681a4dfcfcb35b30fc796a32f?narHash=sha256-DtoqIqM7VkR6NxAkcLpMwmi02USwWb3JdmNGLyhthc0%3D»/lib/modules.nix:1330:5:
         1329|
         1330|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |     ^
         1331|   };

       … while evaluating a branch condition
         at «github:nixos/nixpkgs/293d6abedf0478e681a4dfcfcb35b30fc796a32f?narHash=sha256-DtoqIqM7VkR6NxAkcLpMwmi02USwWb3JdmNGLyhthc0%3D»/lib/modules.nix:1330:21:
         1329|
         1330|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |                     ^
         1331|   };

       … while evaluating definitions from `/nix/store/slca1mzwhpmz93b28zxz8cd5j0f6f2ia-source/flake-modules/images.nix':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: Path 'tests/router-qemu-test.nix' does not exist in Git repository "/tmp/garnix-runs-df7f11d4e53c0d15".