Add publish-openstack-docs-pti job in check/gate CI

Add publish-openstack-docs-pti job in check/gate CI.

Change-Id: I8bbad3d615a3af29ed05d31a2e1cb1d3b99ae460

.zuul.yaml

@@ -3,6 +3,7 @@
       - check-requirements
       - openstack-lower-constraints-jobs
       - openstack-python3-victoria-jobs
+      - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
       jobs:

tox.ini

@@ -76,8 +76,8 @@ exclude = .venv,.tox,dist,doc,*egg,specs,build,*/source/conf.py
 [testenv:docs]
 commands =
   rm -rf api-ref/build
-  sphinx-build -W --keep-going -b html api-ref/source api-ref/build/html
-
+#  sphinx-build -W --keep-going -b html api-ref/source api-ref/build/html
+  sphinx-build -W --keep-going -b html doc/source doc/build/html
 [testenv:api-ref]
 whitelist_externals = rm
 commands =