Draft: Add publish-to-doc kokkuri command
publish-to-doc is analogous to Jenkins 'publish-to-doc' CI job defined in https://gerrit.wikimedia.org/r/plugins/gitiles/integration/config/+/refs/heads/master/jjb/publish.yaml#57
This will be used to refactor https://gitlab.wikimedia.org/repos/releng/scap/-/blob/master/.gitlab-ci.yml#L49