An instance of the Yocto Toaster builder have been setup and is hosted at this site, supporting building LTS releases i.e. Kirkstone and Scarthgap. This toaster is using the layers.zeptoinitiative.org layers, that also covers the LTS releases + any modification done by us.
This is still work is in progress and not complete yet, so this is only partially working, but it can/might be reach at toaster.zeptoinitiative.org, more information on how to use the toaster, how it is setup, and any limitations will be documented here.
Inspiring Best Practices in Yocto and OE Ecosystem