GitHub Action to push subdirectories to separate repositories.

When building Gatsby Themes with a monorepo it's common to need to be able to develop your corresponding starters in the same repo as well. This allows you to automatically push your starters to their own repo so they can be used with gatsby new.

workflow "Update starters" {
  on = "push"
  resolves = ["johno/actions-push-subdirectories"]
  args = "examples"
}

This code is adapted and modified from Gatsby core.