fix: condition for branch target changed to be either ref or workflow ref

[gentlementlegen]

Resolves #124
QA:

• development branch build
• targeted branch build

[whilefoo]

If I understand correctly, because this workflow gets triggered after another workflow run, github.ref will always be the default branch of the repo instead of the branch that Update Configuration and Buildran on, so you can get that branch inworkflow_run.head_branch`?

[gentlementlegen]

@whilefoo correct, please refer to https://docs.github.com/en/webhooks/webhook-events-and-payloads#workflow_run

github.ref would have the proper value if the build is manually triggered, and defaults to the default branch when following a workflow_run.