Fix gitaly setup running always for specs setup
What does this MR do?
Resolves #229736 (closed)
Since we switched to shas in GITALY_SERVER_VERSION, it no longer matches
the VERSION in gitaly. As we cannot update VERSION as that is in another
project, we match GITALY_SERVER_VERSION against checked out git sha
instead, in order to determine if we need to run gitaly setup again
Edited by Thong Kuah