feat: add posargs to tox

allows devs to run specifc tests
`tox -e py310-dj32 -- tests.test_admin.OTPAdminSiteTest.test_otp_admin_without_otp`

Author: dopry

tox.ini

@@ -53,7 +53,7 @@ extras =
 ignore_outcome =
     djmain: True
 commands =
-    coverage run {env:COVERAGE_OPTIONS:} {envbindir}{/}django-admin.py test -v 2 --pythonpath=./ --settings=tests.settings
+    coverage run {env:COVERAGE_OPTIONS:} {envbindir}{/}django-admin.py test -v 2 --pythonpath=./ --settings=tests.settings {posargs}
     coverage report
 
 [testenv:flake8]