Not enabled by default, but whitelisted https://github.com/travis-ci/apt-source-safelist/blob/master/ubuntu.json#L557 and one of the easiest ways to run CI on multiple gcc compiler versions, and architectures since fairly recently (https://docs.travis-ci.com/user/multi-cpu-architectures/).
Not enabled by default, but whitelisted https:/ /github. com/travis- ci/apt- source- safelist/ blob/master/ ubuntu. json#L557 and one of the easiest ways to run CI on multiple gcc compiler versions, and architectures since fairly recently (https:/ /docs.travis- ci.com/ user/multi- cpu-architectur es/).