ref(*): add e2e-runner to repo list

[vdice]

So e2e-runner PRs/master merges processed as other Workflow & co. repos, instead of maintaining separate job (highly similar and prone to diverging)

TODO

• [x] Test in Jenkins by running PR and master e2e-runner pipelines

[deis-bot]

@jchauncey, @arschles and @bacongobbler are potential reviewers of this pull request based on my analysis of git blame information. Thanks @vdice!

[vdice]

e2e-runner ci pipeline vetted in https://ci.deis.io/job/e2e-runner-pr/219/console for https://github.com/deis/e2e-runner/pull/78

[bacongobbler]

Nicely done. 👍