Improve pull request discovery on GitHub Actions

[sasjo]

Hi!
We're evaluating Qodana and look to transition from SonarCloud to Qodana Cloud. We've used SonarCloud from push triggered workflows and are aiming to come up with a solution to allow our teams to use the qodana-action as a drop-in-replacement for our existing sonar action.

We've noticed that the pr-mode and post-pr-comment features only works when triggered by a pull_request event. We have 500+ workflows that typically trigger on push. The workflow starts with a test job that run unit tests, collect coverage and end with the sonar quality gate. The workflow then continues with acceptance testing etc. See this workflow for an example.

SonarCloud will add a comment on any open pull request found for the branch reference. We now wish to find a way to keep our workflows essentially the same, just replace our sonar step with a qodana step and have the same pull request comment behavior.
We believe this can be accomplished with some backward compatible changes in the action. The idea is to use Octokit to find matching pull requests when the PR context isn't already set.

Is this something other's would find useful?

[sasjo]

We are running some experiments in this qodana-action fork.