This removes everything related to docker integration experiments that
we conducted over the last 6 months.
I'll send a follow-up with an alternative suggestion that was demo'ed on
a team meeting in the end of December.
This patch:
- adds a new `Dockerfile.vrt` image file based on focal that installs
VRT-related dependencies inside it.
- updates scripts to build & publish the new docker image.
Drive-by: remove stale file
Andrey Lushnikov
Max Schmitt
Joel Einbinder
Pavel Feldman