CI: run pytest without arguments to avoid stdlib distutils being imported

distutils currently doesn't support pytest collection that doesn't
start at least at the distutils dir or above (and not distutils/tests)
since it requires the local distutils being imported before the tests are run,
otherwise the stdlib distutils takes precedence.

Adjust the pytest call to not pass a path to work around this.

Since pytest currently fails to skip collecting venvs with mingw python
(see pytest-dev/pytest#12544) move the venv
to /tmp instead.

Author: lazka

.github/workflows/main.yml

@@ -146,8 +146,8 @@ jobs:
         run: |
           export VIRTUALENV_NO_SETUPTOOLS=1
 
-          python -m virtualenv venv
-          source venv/bin/activate
+          python -m virtualenv /tmp/venv
+          source /tmp/venv/bin/activate
 
           # python-ruff doesn't work without rust
           sed -i '/pytest-ruff/d' pyproject.toml
@@ -156,8 +156,8 @@ jobs:
       - name: Run tests
         shell: msys2 {0}
         run: |
-          source venv/bin/activate
-          pytest distutils/tests
+          source /tmp/venv/bin/activate
+          pytest
 
   ci_setuptools:
     # Integration testing with setuptools