How to configure Travis-CI to build pull requests & merges to master w/o redundancy

Question

To put it in \"BDD\" terms:

Background:
Given I\'m contributing to a GH repo

When I create a pull request
Then Travis shou

Answer 1

The whitelist approach described in the accepted answer has some significant limitations. In particular, it doesn't support non-redundantly building arbitrary branches without opening a PR.

I opened an issue asking for a better solution.