ci: use isolated MLX build dependencies

Author: apstenku123

.github/workflows/e2e-matrix.yml

@@ -56,7 +56,7 @@ jobs:
       - name: Python deps
         run: |
           "$VBGUI_E2E_PYTHON" -m pip install --disable-pip-version-check \
-            --no-build-isolation -e ".[gui,parquet,widget]"
+            -e ".[gui,parquet,widget]"
       - name: Generate fixtures
         run: |
           "$VBGUI_E2E_PYTHON" tests/fixtures/build_e2e_matrix.py
@@ -111,7 +111,7 @@ jobs:
           echo "VBGUI_E2E_PYTHON=$job_venv/bin/python" >> "$GITHUB_ENV"
       - run: |
           "$VBGUI_E2E_PYTHON" -m pip install --disable-pip-version-check \
-            --no-build-isolation -e ".[gui,parquet,widget]"
+            -e ".[gui,parquet,widget]"
       - run: |
           "$VBGUI_E2E_PYTHON" tests/fixtures/build_e2e_matrix.py
       - working-directory: vbgui
@@ -161,7 +161,7 @@ jobs:
           echo "VBGUI_E2E_PYTHON=$job_venv/bin/python" >> "$GITHUB_ENV"
       - run: |
           "$VBGUI_E2E_PYTHON" -m pip install --disable-pip-version-check \
-            --no-build-isolation -e ".[gui,parquet,widget]"
+            -e ".[gui,parquet,widget]"
       - run: |
           "$VBGUI_E2E_PYTHON" tests/fixtures/build_e2e_matrix.py
       - working-directory: vbgui

tests/test_workflow_runner_policy.py

@@ -63,7 +63,8 @@ def test_macos_e2e_uses_an_isolated_job_venv() -> None:
 
     assert "pip install --upgrade pip" not in workflow
     assert workflow.count("-m venv --system-site-packages") == 3
-    assert workflow.count("--no-build-isolation -e") == 3
+    assert "--no-build-isolation" not in workflow
+    assert workflow.count('-e ".[gui,parquet,widget]"') == 3
     assert workflow.count('echo "VBGUI_E2E_PYTHON=$job_venv/bin/python"') == 3