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Add card-detail-badges
perhaps a separate issue but would recommend also utilizing the card badge functionality with the GitLab logo. Enables users looking at a board to visually identify cards with GitLab attachments & number of merge requests/issues/etc.
https://developers.trello.com/power-ups/capabilities#card-badges
https://gitlab.com/gitlab-org/trello-power-up/issues/21#note_33754638