I noticed you do not have any E-Builds for Gitlabs Continuous runner and thought I'd post my attempt at it. It is a bit dated as I set it up for Gitlab 9.4.6 or something, I can't recall. I might be reviewing it over the next while and will post back accordingly but I shall be away for two weeks so call it a month before I'll be back with something useful.
The following are the files for the Gitlab-runner-bin 9999 build. I got this working first but it fails on x86 machines (Yes I maintain one of those)
I will post the source based version in the next message