GitHub Actions jobs can have different triggers as documented on this page
The following workflow triggers will associate a GitHub Actions job to a Pull Request, affecting the status and listing the job under the Checks tab for that PR.
pull_requestpull_request_reviewpull_request_review_commentpull_request_targetpush
The pull_request trigger has several sub-types that we can take advantage of. Note that pull_request_review and pull_request_review_comment only trigger when a comment is left on a file diff.
This repository contains two sample GitHub Actions jobs. One job (automatic-ci) runs whenever a Pull Request is opened, re-opened, or updated. The other job (manual-ci) requires manual intervention. It will be created and run when the label run-test is added to a Pull Request. Note that this job will be created whenever any label is added to a PR, but will be skipped unless the label name is run-test. Once the job is created, it can be manually rerun from the Checks tab if necesssary.