ci: install Python the same way everywhere

For wheel builds, we shouldn't create a virtualenv, as it conflicts
with the check phase

.github/actions/setup-dependencies/action.yml

@@ -7,6 +7,10 @@ inputs:
     description: "Wether to install 3rd Party dependencies (for tests)"
     required: false
     default: "true" # unfortunately boolean variables are not supported
+  create-venv:
+    description: "Should a virtualenv be created"
+    required: false
+    default: "true"
 
 name: "Setup dependencies"
 description: "Install all required dependencies for worflows to run."
@@ -29,5 +33,11 @@ runs:
         python-version: ${{ inputs.python-version }}
 
     - name: Install the project
+      if: inputs.create-venv == 'true'
       run: uv sync
       shell: bash
+
+    - name: Setup pip # some tools need it, and uv virtualenvs doesn't contain it
+      if: inputs.create-venv == 'true'
+      run: uv pip install pip
+      shell: bash

.github/workflows/CI.yml

@@ -36,9 +36,6 @@ jobs:
       - name: Checkout source code
         uses: actions/checkout@v4
 
-      - name: Setup Python
-        uses: actions/setup-python@v5
-
       - name: Setup 3rd party dependencies
         uses: ./.github/actions/setup-dependencies
         with:
@@ -128,9 +125,11 @@ jobs:
       - name: Checkout source code
         uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v5
+      - name: Setup 3rd party dependencies
+        uses: ./.github/actions/setup-dependencies
         with:
-          python-version: 3.x
+          install-test-deps: "false"
+          create-venv: "false"
 
       - name: Build wheels
         uses: PyO3/maturin-action@v1
@@ -220,9 +219,11 @@ jobs:
       - name: Checkout source code
         uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v5
+      - name: Setup 3rd party dependencies
+        uses: ./.github/actions/setup-dependencies
         with:
-          python-version: 3.x
+          install-test-deps: "false"
+          create-venv: "false"
 
       - name: Build wheels
         uses: PyO3/maturin-action@v1