These builds are being run per-checkin, as well as nightly. There are updates for nightly builds. Obviously, there’s a lot of details to still work through (crash symbols, release builds, signing, etc…), but this is a major milestone worth noting. You can follow progress, and offer help to kmoir, on the remaining work in bug#750366.
As always with standing up new platforms in production, if you see problems on tbpl.m.o, please do not just hide the breakages; instead, please file bugs in mozilla.org:ReleaseEngineering and we’ll be happy to investigate.
Big thanks to kmoir, callek, jmaher, blassey and others for making this happen.