bots: Provide flag file for skipping zero-disk
bots: Provide flag file for skipping zero-disk

This is useful for throwaway images which don't get uploaded anywhere.
As requested by @jscotka to speed up downstream testing.

garrett/cockpit,deryni/cockpit,mareklibra/cockpit,deryni/cockpit,martinpitt/cockpit,mvollmer/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,SotolitoLabs/cockpit,garrett/cockpit,SotolitoLabs/cockpit,garrett/cockpit,andreasn/cockpit,stefwalter/cockpit,andreasn/cockpit,martinpitt/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,andreasn/cockpit,mareklibra/cockpit,garrett/cockpit,cockpituous/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,cockpit-project/cockpit,cockpituous/cockpit,mareklibra/cockpit,deryni/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,stefwalter/cockpit,cockpit-project/cockpit,mvollmer/cockpit,deryni/cockpit,mvollmer/cockpit,cockpituous/cockpit,stefwalter/cockpit,stefwalter/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,deryni/cockpit,garrett/cockpit,andreasn/cockpit,mvollmer/cockpit,deryni/cockpit,mareklibra/cockpit,stefwalter/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,deryni/cockpit,cockpit-project/cockpit,andreasn/cockpit,mareklibra/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpituous/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit