Use Go 1.10 for source installations

Jacob Vosmaer requested to merge go-1.10-source-installs into master

What does this MR do?

Tell source installations to use the current stable version of Go (Go 1.10) instead of an obsolete version that no longer gets security updates (Go 1.8).

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes gitaly#1231 (closed)

Edited by Jacob Vosmaer

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