Pull Request URL env var

Description of the feature request

Use case / for what or how I would use it

Add PullRequest URL in format that can be opened directly

I want to display the Pull request URL on slack message when building finishes, so other developers can visit the PR, and approve/merge it, etc…

Nowadays, Bitrise shows the URL in the build config:

But, there’s no envvar for this, I needed to build it from the BITRISE_PULL_REQUEST var (id)

Great idea, thanks for the #feature-request @bernat_borras! :slight_smile: