Small build tweaks

.github/workflows/python-package.yml

@@ -10,7 +10,6 @@ on:
     - ".github/workflows/python-package.yml"
     - "pyproject.toml"
     - "setup.py"
-    - "setup.cfg"
     - "src/**/*"
     - "tests/*"
   pull_request:
@@ -34,7 +33,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install build flake8 pytest pytest-xvfb
+        python -m pip install build flake8
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
@@ -53,6 +52,7 @@ jobs:
     - name: Install test dependencies
       run: |
         sudo apt-get install mesa-utils xvfb
+        python -m pip install pytest pytest-xvfb
     - name: Test with pytest
       run: |
         pytest