This image is intended to be run by contributors or as Jenkins agent.
For contributors local workflow, a run script is provided, with a similar
logic to our Arcanist wrapper: it creates an image running with a uid similar
to local user.
Salt is installed through upstream package. Python dependencies are installed
from requirements.txt. To build the image, a Makefile script is provided.
The image isn't a full development workspace: it doesn't provide editors
like vim or nano.
Ref T2283