how to trigger a downstream pipeline on a tagged branch in gitlab multi project pipeline?

I would like to trigger a GitLab project, but instead of using a branch, I would like to use a specific tag. How can this be achieved?

The following triggers the develop branch of some-project:

bridge:
  stage: bridge
  trigger:
    project: some-project
    branch: develop

>Solution :

You can use the parent-child pipeline feature with the ref keyword, like this:

bridge:
  stage: bridge
  trigger:
    include:
      - project: some-project
        ref: 'your-tag'
        file: '.gitlab-ci.yml'