Only do doc-publish on velcro/master when necessary
Only do doc-publish on velcro/master when necessary

Use the gitlab-ci "only" filter to run the doc update step only when on the
velcro master branch, so user forks won't publish incorrect docs, or have build
failures

Also, only attempt to commit when there are actually doc changes

michaeldayreads/marathon-bigip-ctlr,michaeldayreads/marathon-bigip-ctlr,michaeldayreads/marathon-bigip-ctlr