repo-updater: Choose global external service using GloudGlobal flag
Created by: ryanslade
Only applicable when running on Sourcegraph.com
Closes: https://github.com/sourcegraph/sourcegraph/issues/14985
Created by: ryanslade
Only applicable when running on Sourcegraph.com
Closes: https://github.com/sourcegraph/sourcegraph/issues/14985