Specify a workflow for flaky-rate report

[ivirabyan]

According to docs, flaky-rate report searches artifacts in the same workflow. It implies that you run report in the same workflow that you run your tests in. However, searching for previous artifacts may take a long time (we've seen it takes ~1 minute to build flaky rate report). So we'd like to run flaky rate report in a separate (periodic) workflow, but unable to because of this "same workflow" filtering. Would it be possible to manually specify a workflow to search as an input?