Makefile: Disable parallel make.

Because many dependencies are missing, it is not safe to run parallel make. Alternately, this could be fixed by adding the missing dependencies, but that would be a larger change; and it seems to be planned that the Makefile be phased out anyway.

Fixes issue #201 .

@lukeshu Thanks for the merge request! Can you please add shared runners to your project to kick-off builds?

Sure thing. They're enabled now!

I don't understand the failure message from the build.

ERROR: Preparation failed: Post https://67.205.166.89:2376/v1.18/images/create?fromImage=docker%3Adind: net/http: timeout awaiting response headers

@grzesiek does this even make sense? A MR from a fork should kick off a new docker image build?

@jacobvosmaer-gitlab This looks like a intermittent network failure while connecting to the Registry. @lukeshu can you please retry the pipeline? Thanks!

I'd tried to retry it a few times, but I never got it to work. Anyway, this was the same as 7fe07938.

closed