Retry if we can't get to github.
Retry if we can't get to github.

We sometimes can't get to github because of intermittent network issues. We should
try a few times before we declare it a failure.

gsehub/configuration,hks-epod/configuration,Stanford-Online/configuration,mitodl/configuration,appsembler/configuration,EDUlib/configuration,EDUlib/configuration,rue89-tech/configuration,proversity-org/configuration,mitodl/configuration,appsembler/configuration,EDUlib/configuration,hastexo/edx-configuration,stvstnfrd/configuration,hastexo/edx-configuration,Stanford-Online/configuration,edx/configuration,rue89-tech/configuration,stvstnfrd/configuration,hastexo/edx-configuration,hks-epod/configuration,michaelsteiner19/open-edx-configuration,arbrandes/edx-configuration,appsembler/configuration,stvstnfrd/configuration,rue89-tech/configuration,proversity-org/configuration,hastexo/edx-configuration,Stanford-Online/configuration,EDUlib/configuration,hastexo/edx-configuration,hks-epod/configuration,Stanford-Online/configuration,stvstnfrd/configuration,arbrandes/edx-configuration,rue89-tech/configuration,mitodl/configuration,hks-epod/configuration,appsembler/configuration,proversity-org/configuration,stvstnfrd/configuration,arbrandes/edx-configuration,proversity-org/configuration,Stanford-Online/configuration,edx/configuration,proversity-org/configuration,gsehub/configuration,arbrandes/edx-configuration,gsehub/configuration,gsehub/configuration,EDUlib/configuration,michaelsteiner19/open-edx-configuration,arbrandes/edx-configuration,edx/configuration,rue89-tech/configuration,gsehub/configuration,michaelsteiner19/open-edx-configuration,michaelsteiner19/open-edx-configuration,mitodl/configuration,hks-epod/configuration,edx/configuration