Add allowed-projects to static publish jobs

The jobs publish-tox-docs-static and promote-tox-docs-static publish
content to specific web sites, ensure that they are only used by the
repositories that should publish there. This is done with adding an
allowed-projects declaration for current users of the jobs.

Depends-On: https://review.opendev.org/678352
Change-Id: I796cff233f7a8d1380f163aea1b4fc2d3059c16b

zuul.d/jobs.yaml

@@ -712,6 +712,8 @@
       Publish content to static.openstack.org to
       /srv/static/{{ zuul.project.short_name }}
     final: true
+    allowed-projects:
+      - openstack/releases
     vars:
       static_target: "{{ zuul.project.short_name }}"
 
@@ -721,6 +723,9 @@
     description: |
       Promote content to static.openstack.org to
       /srv/static/{{ zuul.project.short_name }}
+    allowed-projects:
+      - openstack/election
+      - openstack/transparency-policy
     final: true
     vars:
       static_target: "{{ zuul.project.short_name }}"