fix build error getting dash scan

scripts/generate_python_metadata_cache.py

@@ -87,8 +87,8 @@ def run_dash_license_scan(lockfiles: list[str], summary_path: str) -> bool:
     """
     cache_dir = tempfile.mkdtemp(prefix="dash-license-scan-")
     env = os.environ.copy()
-    env["UV_CACHE_DIR"] = cache_dir
-    env["UV_TOOL_DIR"] = cache_dir
+    env["UV_CACHE_DIR"] = str(Path(cache_dir) / "cache")
+    env["UV_TOOL_DIR"] = str(Path(cache_dir) / "tools")
     command = [
         _find_uvx(),
         "--from",

tests/test_generate_python_metadata_cache.py

@@ -14,13 +14,33 @@
 import os
 import tempfile
 import unittest
+from pathlib import Path
+from unittest.mock import patch
 
 from scripts.generate_python_metadata_cache import (
     parse_dash_summary,
     parse_requirements_lockfile,
+    run_dash_license_scan,
 )
 
 
+class TestRunDashLicenseScan(unittest.TestCase):
+    @patch("scripts.generate_python_metadata_cache.subprocess.run")
+    def test_uses_separate_uv_cache_and_tool_directories(self, mock_run):
+        mock_run.return_value.returncode = 0
+        mock_run.return_value.stderr = ""
+
+        run_dash_license_scan(["requirements.txt"], "summary.csv")
+
+        env = mock_run.call_args.kwargs["env"]
+        cache_dir = Path(env["UV_CACHE_DIR"])
+        tool_dir = Path(env["UV_TOOL_DIR"])
+        self.assertNotEqual(cache_dir, tool_dir)
+        self.assertEqual(cache_dir.parent, tool_dir.parent)
+        self.assertEqual(cache_dir.name, "cache")
+        self.assertEqual(tool_dir.name, "tools")
+
+
 class TestParseRequirementsLockfile(unittest.TestCase):
     def test_pinned_packages_and_hashes(self):
         fd, path = tempfile.mkstemp(text=True)