Taken from PR 199917 with minor modifications.
Proposed commit message:
new port: textproc/rubygem-html-pipeline-gitlab Rubygem containing extension filters for html-pipeline used by GitLab WWW: https://gitlab.com/gitlab-org/html-pipeline-gitlab PR: 199917 Submitted by: Torsten Zuehlsdorff <ports@toco-domains.de> Approved by: swills (mentor), mat (mentor)