Add packages for raspbian stretch
Problem
It has become increasingly unlikely that any new setup of a pi is going to be running jessie. (Noobs doesn't list jessie in the installer anymore)
Solution
I think it's time to add builders for stretch. Current workaround is to install the jessie package on stretch, which is less than ideal.
Also we should update the install page. GitLab can be run on a pi2 or pi3 provided that you have increased the swap to at least 1GB, and are running raspbian jessie or stretch. To reduce cpu usage, I also suggest disabling prometheus monitoring.
Edited by Joshua Lambert