Add a CI workflow for performing rustc-pull automatically #2202
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The CI workflow is configured to run weekly on Monday morning, and it can also be executed manually through
workflow_dispatch
. The workflow runsrustc-pull
, and if it actually pulled something, it force pushes to therustc-pull
branch, which is a sticky branch that should only be used for rustc pull updates.If there is an open PR created by the Github Actions bot, it will be updated by that push. If not, the workflow creates a new PR. This PR also opts this repo into the auto open/close PR functionality from triagebot, so that CI runs on pull requests opened by the GitHub Actions bot user.
The PR also adds explicit error messages if there is nothing to pull during
rustc-pull
.This is how such a PR looks like.