split setuptools/wheel and requirements installation

.github/workflows/tests.yml

@@ -4,6 +4,8 @@ on:
   pull_request:
 
 jobs:
+  env:
+    UV_SYSTEM_PYTHON: 1
 
   run:
     runs-on: ${{ matrix.os }}
@@ -44,10 +46,11 @@ jobs:
             pyproject.toml
             requirements/requirements*.txt
 
+      - name: Update setuptools/wheel
+        run: uv pip install -U setuptools wheel
+
       - name: Install dependencies
-        run: |
-          uv pip install --system -U setuptools wheel
-          uv pip install --system -r requirements.txt -r requirements/requirements-test.txt django~=${{ matrix.django-version }} cryptography~=${{ matrix.cryptography-version }} pydantic~=${{ matrix.pydantic-version }}
+        run: uv pip install -r requirements.txt -r requirements/requirements-test.txt django~=${{ matrix.django-version }} cryptography~=${{ matrix.cryptography-version }} pydantic~=${{ matrix.pydantic-version }}
 
       - name: Initialize demo
         run: python dev.py init-demo