Add Zuul v3 jobs
Add Zuul v3 jobs

Use native v3 jobs for building and publishing the documents.

Needed-By: I6de24ab8a99a219af2ac2515df7d307326b4cf5f
Change-Id: I3d1a41157d8a588b5a6877139a230c2a2fabc56f

openstack/training-guides,openstack/training-guides