Custom armhf dockerized gitlab-runner doesn't work in detached mode
[Please see this StackOverflow post for reference](https://stackoverflow.com/q/60741298/6301103)
I have a gitlab-runner in a docker container, that only works, when started in an interactive session using `gitlab-runner start` and when keeping the session active. `gitlab-runner run` and others don't seem to work, and even `gitlab runner start && tail -f /dev/null` which *should* have the same effect, doesn't seem to work. I am not familiar with the gitlab-runner itself but I suspect that some behaviour of the runner that I am not aware is causing this to happen.
How can I get the gitlab-runner working in a detached docker container?
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