[tests] Add login_tests-ci.yml
[tests] Add login_tests-ci.yml

login_logout_tests.py should not run in parallel tasks.
This action only runs login_logout_tests.py with max-parallel: 1
and is invoked after other tests are finished.

Bug: T298761
Change-Id: I236ffc5480cbb738c21d3cee566ab2889fc5e580

wikimedia/pywikibot-core,wikimedia/pywikibot-core