...
2020-Dec-14: There is a process that involves the keyword "stage-release" (see section "Triggering Jenkins jobs from Gerrit" above) to publish packages to packagecloud. This works with two merges. First one with updates to ci/package-tag.yaml and ci/control. Merge that change and after merging add a comment with only the keyword "stage-release". After this create a second review for an updated "releases/*.yaml" with correct version, log_dir and ref with commit hash. Submit that change for merging as well. This will do the actual moving of the package from the staging directory in packagecloud to the release directory. A bit of information on this is also available in section "PackageCloud Release Files" from this LF guide: link.
OLD notes: The self-release process for PackageCloud is in active development as of December 2019. Until it is ready, write a ticket at https://jira.linuxfoundation.org/servicedesk
...