Announce deprecation of openSUSE 42.3
openSUSE 42.3 reaches its end of life on June 30, 2019. So ideally, GitLab 12.0 should be the last version supporting it. But since we have #4273 open and concerns were already raised regarding these deprecation notices being too soon, let's build packages for it at least till 12.1, and drop support in 12.2. We will be packaging for openSUSE 15.0 in 12.0 - #3812 (closed) .
Worst case scenario: We need an update to builder images after June 30th, and openSUSE already removed archives for 42.3 and thus the build fails. In such cases, we will have to pull the latest builder image and do the update on top of it and push it back manually. IIRC, we have done this in the past.
For now, let's mark openSUSE 42.3 as deprecated in reconfigure runs.
Edited by Balasankar 'Balu' C