Add reusable workflow for performing rustc-pull on CI #9
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This PR adds a reusable CI workflow from https://github.com/rust-lang/rustc-dev-guide/blob/master/.github/workflows/rustc-pull.yml and generalizes it so that it can be used on other repositories.
The README.md explains how the workflow works. The TLDR is that it runs
rustc-josh-sync pull
on the subtree and automatically creates/updates a running PR with the changes.We should still improve the logic so that we don't create a PR if the diff is empty, but that's orthogonal to this.