tl deploy: CI fixes for sandbox-only path

- .github/workflows/integration_test.yaml: drop the --build-env flags
  from the `tl deploy` step. The flag no longer exists on the Python
  argparse since the v2/v3 paths were removed; `tl build-images` keeps
  its --build-env (used by the local Docker workflow only).
- black + isort: reflow deploy.py and test_deploy.py to match the
  formatter's expected style.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: diptanu

.github/workflows/integration_test.yaml

@@ -90,9 +90,7 @@ jobs:
                 --build-env PIP_EXTRA_INDEX_URL=https://pypi.org/simple/
 
               echo "--- 2. Deploy ---"
-              tl deploy /tmp/test_app.py \
-                --build-env PIP_INDEX_URL=https://test.pypi.org/simple/ \
-                --build-env PIP_EXTRA_INDEX_URL=https://pypi.org/simple/
+              tl deploy /tmp/test_app.py
 
               echo "--- All integration tests passed ---"
             '

src/tensorlake/cli/deploy.py

@@ -244,9 +244,7 @@ def _prepare_images(functions: list[Function]) -> dict[str, ImageRef]:
                     }
                 )
                 sys.exit(1)
-            image_refs[image._id] = ImageRef(
-                kind="sandbox_template", id=template_name
-            )
+            image_refs[image._id] = ImageRef(kind="sandbox_template", id=template_name)
 
     _emit({"type": "build_done"})
     return image_refs

tests/cli/test_deploy.py

@@ -126,7 +126,9 @@ def fake_build(image, *, emit):
                 return {"name": f"{image.name}-template"}
 
             with (
-                patch.object(deploy_module, "build_sandbox_image", side_effect=fake_build) as build,
+                patch.object(
+                    deploy_module, "build_sandbox_image", side_effect=fake_build
+                ) as build,
                 patch.object(deploy_module, "_emit"),
             ):
                 refs = deploy_module._prepare_images(functions)
@@ -138,9 +140,7 @@ def fake_build(image, *, emit):
             {ref.id for ref in refs.values()},
             {"image-a-template", "image-b-template"},
         )
-        self.assertTrue(
-            all(ref.kind == "sandbox_template" for ref in refs.values())
-        )
+        self.assertTrue(all(ref.kind == "sandbox_template" for ref in refs.values()))
         self.assertIn(image_a._id, refs)
         self.assertIn(image_b._id, refs)
 
@@ -166,7 +166,9 @@ def app() -> str:
             ):
                 refs = deploy_module._prepare_images(functions)
 
-        self.assertEqual(refs[image._id], ImageRef(kind="sandbox_template", id="my-fn-image"))
+        self.assertEqual(
+            refs[image._id], ImageRef(kind="sandbox_template", id="my-fn-image")
+        )
 
     def test_sandbox_build_failure_emits_build_failed_and_exits(self):
         image = Image(name="broken-image")
@@ -286,13 +288,21 @@ def hello() -> str:
             }
 
             with (
-                patch.object(deploy_module, "_build_context_from_env", return_value=auth),
+                patch.object(
+                    deploy_module, "_build_context_from_env", return_value=auth
+                ),
                 patch.object(deploy_module, "load_code"),
-                patch.object(deploy_module, "validate_loaded_applications", return_value=[]),
-                patch.object(deploy_module, "format_validation_messages", return_value=[]),
+                patch.object(
+                    deploy_module, "validate_loaded_applications", return_value=[]
+                ),
+                patch.object(
+                    deploy_module, "format_validation_messages", return_value=[]
+                ),
                 patch.object(deploy_module, "has_error_message", return_value=False),
                 patch.object(deploy_module, "list_secret_names", return_value=[]),
-                patch.object(deploy_module, "_warning_missing_secrets", return_value=[]),
+                patch.object(
+                    deploy_module, "_warning_missing_secrets", return_value=[]
+                ),
                 patch.object(deploy_module, "get_functions", return_value=functions),
                 patch.object(
                     deploy_module, "_prepare_images", return_value=image_refs