It is now possible to configure pipelines to be triggered by commenting run-ci on a GitHub pull request.
This gives teams more control over when pipelines run - for example allow re-running pipelines without pushing new commits, or triggering builds for draft PRs and work-in-progress branches.
This trigger option is available to all organizations using GitHub, as long as they have installed the CircleCI GitHub App integration. Access it by adding a new GitHub trigger to a GitHub App pipeline.
Support for custom comment keywords is on the roadmap.
For more information and a full list of GitHub trigger event options, visit the Docs page.