[libre-riscv-dev] Building Docker Containers

[Jacob Lifshay]

I'm in the process of adding .gitlab-ci.yml files to all the repos, they
will be used for running CI on the git mirrors on debian salsa using my
build server. I'm writing them to be based on the debian:10 docker image
(basically a debian 10 minimal install) such that anyone who wants can copy
and run the commands from the .gitlab-ci.yml knowing that they are tested
on every commit. See
https://git.libre-riscv.org/?p=nmutil.git;a=blob;f=.gitlab-ci.yml;hb=HEAD
for a WIP version for nmutil.

Jacob