devops: attempt to free space before running docker tests (#11084)
devops: attempt to free space before running docker tests (#11084)

Docker runs fail with "No space left on device" error.
This patch follows advice given here: https://github.com/actions/virtual-environments/issues/2840#issuecomment-790492173
microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright