This change adds a new linux worker and adds a build configuration that matches one we run internally. Our internal buildbot was setup a while ago on Ubuntu 18 which contains GCC 7.5 which is still supported, but due to it's age, sometimes does fail, so it would be good to have a public buildbot which mirrors our internal buildbot configuration so that these problems can be found more quickly.
The patch itself looks good.
Could you re-phrase the title and the description, please? Explaining the purpose of the new build configuration without referencing “ our internal build bot”, which people are not necessarily familiar, will be great.