Download a file from the run record. You can download any file that
was uploaded to the run record via
upload_folder_to_run(), or any file that was written out to
./logs folders during a run.
You can see what files are available to download from the run record
download_file_from_run(run, name, output_file_path = NULL)
A string of the name of the artifact to be downloaded.
A string of the local path where to download the artifact to.