Infrabox is not providing GITHUB_PULL_REQUEST_NUMBER build arg

[abner-math]

See this job I triggered few minutes ago https://infrabox.datahub.only.sap/dashboard/#/project/datahub-flowagent/build/9826/1/job/flowagent-lint In "Prepare job" the GITHUB_PULL_REQUEST_NUMBER arg is missing.

On another hand, there are other jobs https://infrabox.datahub.only.sap/dashboard/#/project/vsystem/build/11905/1/job/Create%20Jobs where it is present