Hi @sakebook,
You most likely specified those env vars in Secrets. As noted on the UI, right now Secrets are never exposed for pull request builds. Please see: Exact same workflow fails with PR event as opposed to push event/manual run
If you’d want to be able to specify which secrets can be exposed for pull request builds, please vote & comment on this #feature-request : Secret Env Vars and (Generic) File Storage files: control whether it’s available in Pull Request builds
And of course if you have any questions just let us know! 