In my pull request

https://github.com/jenkinsci/matrix-auth-plugin/pull/4

I was planning to add a "latest master build" link.

The link I used is

https://jenkins.ci.cloudbees.com/buildStatus/icon?job=plugins/matrix-auth-plugin&style=plastic

which just links to the latest build (of any "pull request" request).

Please consider exposing the latest "master" build status link.

Thanks