GHA to update specified branch(es) of a forked repo

[agritheory]

This can run weekly or some other specified interval and should fetch the configured branches of the remote repo

It's possible there's an off the shelf solution for this in the GHA marketplace but I didn't find an obvious one

[coleandreoli]

This looks like a promising solution: https://github.com/aormsby/Fork-Sync-With-Upstream-action