[PATCH v4] dts: add Dockerfile

[Thomas Monjalon]

21/02/2024 04:40, Patrick Robb:
> Tested-by: Patrick Robb <probb at iol.unh.edu>
> 
> The approach for mounting in ssh keys and managing the test engine
> environment has been agreed upon by the CI group, and this patch has been
> tested by a few people at the Community Lab. I believe it is ready to be
> merged.

Applied, thanks.

Note: few minor adjustments were made in the README and devtools.