Use bionic for openstack-manuals publishing
We switched to bionic in change
for building, update the
publish job as well so that it works.
Note that this build job does not create a root-marker file,
this has to be done by scripts called from tox.
+ nodeset: ubuntu-bionic
pre-run: playbooks/project-config/pre-tox.yaml
run: playbooks/project-config/run-tox.yaml
roles:
