Add build-tox-docs and build-openstack-docs-pti

Add new templates to use in repos for building docs only.

Change-Id: Ia639dafe9692aece0204058fb99cb12ed042f103

zuul.d/project-templates.yaml

@@ -78,6 +78,19 @@
       jobs:
         - publish-openstack-sphinx-docs
 
+- project-template:
+    name: build-openstack-docs-pti
+    description: |
+      Runs normal `OpenStack PTI documentation build and publication jobs
+      <https://governance.openstack.org/tc/reference/project-testing-interface.html#documentation>`_
+      following the project testing interface.
+    check:
+      jobs:
+        - openstack-tox-docs
+    gate:
+      jobs:
+        - openstack-tox-docs
+
 - project-template:
     name: publish-openstack-docs-pti
     description: |
@@ -106,6 +119,18 @@
       jobs:
         - publish-openstack-tox-docs
 
+
+- project-template:
+    name: build-tox-docs
+    description: |
+      Runs tox docs jobs without publishing.
+    check:
+      jobs:
+        - tox-docs
+    gate:
+      jobs:
+        - tox-docs
+
 - project-template:
     name: publish-tox-docs-infra
     description: |