Required Build settings for Harness

[Olga Melnichenko]

I want to set up my bitbucket PRs to only be able to be merged when a certain build completes on my Harness build server. There is a "Required Builds" option on the repo but I don't know what value to put into the "Add Builds" section of the form. The documentation says:

Add any build keys here that will need to successfully pass before merging a pull request. The build key will depend on the CI tool used to generate the build.

But I don't know what the build key is for a build in Harness. I tried the project name and the pipeline identifier but neither work.