Add transitioning for PR events

[kuritz]

Context

It's been requested to transition stories in response to certain pull_request events.

Analysis

All of the basic pieces already exist to do this. Its a slightly different/smaller number of steps to just transition a story, so at least for now, can live with a bit of duplication and simply split all non-release-cases to a diff entrypoint to the clubhouse module.

Solution

• Added transitionStories to handle non-releases
• Updated the action's run entrypoint to conditionally invoke ch depending on the event
• Added test for extracting story ID from PR Title
• Updated README
• Repackaged

Testing

Ran on the testing repo:
https://github.com/farmersdog/clubhouse-action-test/pull/1/checks?check_run_id=814832485

[dillonjason]

I wonder if you should use the branch name instead of the PR title?

[kuritz]

Yeah that would make sense too. Did the title on the assumption that we would have that other piece that automatically places the tag in the PR title, if a story id exists in the branch name. But i think it would be easy to add a toggle to this to make it configurable.

[kuritz]

dismissed dillonjason’s stale review via 25e3228 1 hour ago

^ this is new, interesting.

anyway, i updated it to take the branch, title, and body and combine them to find all stories in any of them, and then deduplicate as part of the extraction process. so we can use the branch or the title or both and it shouldn't matter.