BLD Add DISTDIR variable. ### Description

Adds `DISTDIR` env variable that points to the directory where libraries should be copied to when building shared libraries with recipe.

### Checklists

- [x] Add new / update outdated documentation

from pytest_pyodide import run_in_pyodide


@run_in_pyodide(packages=["test"], pytest_assert_rewrites=False)
def test_test(selenium):
    # this is tested in test_core_python.py instead
    pass

from pytest_pyodide import run_in_pyodide


@run_in_pyodide(packages=["test"], pytest_assert_rewrites=False)
def test_test(selenium):
    # this is tested in test_core_python.py instead
    pass
