Sharing GCP Source repository for the Cloud build of second project

Question

I've been searching through similar questions but none of them was quite answered.

I have 2 GCP Projects, Project A is running one environment and has connected Bitbucket, which is cloned into Source Repository. Then I want to run Cloud Build from project B with a repository from project A.

First of all, I gave Source Repository Administrator permission to [email protected] on project A.

This still doesn't allow me to create triggers because I can't list connected repositories on project B, even though it has permissions. However, I successfully created these triggers via Terraform where I followed the basic approach of creating triggers and defined trigger_teplate like this:

  trigger_template {
    project_id  = "ProjectA"
    branch_name = "dev"
    repo_name   = "bitbucket_org_reponame"
  }

After applying the terraform, it created the trigger and I was able to run it manually and it worked, however, it still shows that repositories are not connected. This means that the trigger can't run automatically and for manual invocation, I always have to write down the branch which I want to use.

This is quite inconvenient for me, did I miss something? Some permissions that I need to add, is it still impossible even when this works partially?