Failed `package-and-qa` for the `v12.4.1` tag

Job #337369993 failed for gitlab-foss@4281915c:

$ ./scripts/trigger-build omnibus
/usr/local/bundle/gems/gitlab-4.12.0/lib/gitlab/request.rb:54:in `validate': Server responded with code 400, message: 'base' Insufficient permissions to create a new pipeline. Request URI: https://gitlab.com/api/v4/projects/gitlab%2Dorg%2Fbuild%2Fomnibus%2Dgitlab%2Dmirror/trigger/pipeline (Gitlab::Error::BadRequest)
	from /usr/local/bundle/gems/gitlab-4.12.0/lib/gitlab/request.rb:46:in `block (2 levels) in <class:Request>'
	from /usr/local/bundle/gems/gitlab-4.12.0/lib/gitlab/client/pipeline_triggers.rb:96:in `run_trigger'
	from /usr/local/bundle/gems/gitlab-4.12.0/lib/gitlab.rb:28:in `method_missing'
	from ./scripts/trigger-build:21:in `invoke!'
	from ./scripts/trigger-build:240:in `<main>'