Allow upstream remote name to be customized
Allow upstream remote name to be customized

If you are working in a straight clone of upstream's repository,
the upstream remote will be named "origin" by default, not "upstream".
Allow the user to set the name of the remote using a Git configuration
value (ghpr.upstreamRemote), to accommodate this scenario.

saab-simc-admin/workflow-tools,saab-simc-admin/workflow-tools