I had a successful parallel build (aka build-pkgs --parallel) inside the docker container.   ~1h45m on 24 core, 64G ram

The prerequisite was a populated $MY_REPO/cgcs-tis-repo/dependancy-cache.

Currently we only generate the cache after the build in the 'generate-cgcs-tis-repo' step.  I'd like to see the cache stored in git and updated regularly by 'official' builds. 

Note: The cache doesn't have to be perfect, so a cache that is out of date by a day or a week is still very useful.  build-pkgs/mockchain just needs a rough guide on build dependencies and potential dependency loops.

Scott