Does BPS have a Dockerfile for RT (4.4.4 or 5.0)

We’re running RT 4.4.1 in production and want to experiment with the latest versions in order to upgrade soon. We’ve dockerized our test site(s), but having a BPS Official/Default/etc starting point would save us time.

Where’s the best place to find dockerfiles of RT 4.4.4? Or even 5.0, though I know it may be a bit early for the latter. Can’t wait till it’s released by the way!